Broccoli Cauliflower Casserole Recipe - (2024)

Broccoli Cauliflower Casserole Recipe - (1)

By: Becky Hardin

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Broccoli Cauliflower Casserole is an easy side dish you’re sure to love! This broccoli and cauliflower gratin recipe is so cheesy and delicious. Be sure to add this creamy, cheesy side dish to your holiday table!

Broccoli Cauliflower Casserole Recipe - (2)

Table of Contents

Why We Love This Broccoli and Cauliflower Casserole

  • Easy. This broccoli and cauliflower gratin recipe only takes about 30 minutes from start to finish!
  • Flavorful. The cheese sauce is the real star of the show! So creamy, dreamy, and delicious.
  • Healthy(ish). Cauliflower is the go-to vegetable when you need something to replace starchy potatoes. It helps cut down on carbs and create a healthier version of au gratin potatoes.
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How to Store and Reheat

Store leftover broccoli cauliflower casserole tightly wrapped with plastic wrap or aluminum foil in the refrigerator for up to 4 days. Reheat in a 350°F oven for 20-30 minutes, or until warmed through.

How to Freeze

You can freeze this broccoli and cauliflower gratin if you want to prepare it ahead of time or just save leftovers. I wouldn’t recommend this as something to freeze since it will change the texture of the broccoli and cauliflower, but it is definitely doable. Just cover the dish and freeze as you would a casserole. Then let it thaw in the refrigerator and bake when you’re ready to eat.

Serving Suggestions

Serve this broccoli cauliflower casserole alongside your favorite holiday mains, like Thanksgiving turkey, brown sugar glazed ham, or beef tenderloin! Add some holiday sides and you’ve got the perfect dinner!

Can I substitute fresh broccoli for frozen in a casserole?

Yes! You can use frozen broccoli and cauliflower. If using, use one bag of each and cook in the microwave according to package instructions. Pat dry before stirring into the cheese sauce. I like the steam fresh kind best.

How do I make sure my cheese sauce doesn’t split?

We’re making a roux out of butter and flour to help thicken up the sauce and bind it together. This will prevent the sauce from splitting, so long as you don’t put it over too high of heat!

Why is my au gratin watery?

If the broccoli and cauliflower are not patted dry before being added to the casserole, they can introduce extra moisture that will cause the casserole to turn watery as it bakes.

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More Gratin Recipes To Try

  • Au Gratin Potatoes
  • Brussels Sprouts Gratin
  • Zucchini Au Gratin
  • Asparagus Au Gratin
  • Cauliflower Au Gratin

Recipe

Broccoli Cauliflower Casserole Recipe

4.63 from 127 votes

Author: Becky Hardin

Prep: 10 minutes minutes

Cook: 20 minutes minutes

Total: 30 minutes minutes

Broccoli Cauliflower Casserole Recipe - (6)

Serves8

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This broccoli and cauliflower gratin is cheesy, creamy, and easy to make. You're going to love this broccoli cauliflower casserole recipe for Thanksgiving, Christmas, Easter, and more!

Step-by-step photos can be seen below the recipe card.

Broccoli Cauliflower Casserole Recipe - (7)

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Ingredients

For the Topping

  • 3 slices sandwich bread white or wheat; a little dry is best (see note)
  • 2 tablespoons unsalted butter room temperature (¼ stick)
  • ¼ teaspoon table salt
  • teaspoon freshly ground black pepper

For the Filling

  • 1 head cauliflower (about 1½ pounds)
  • 1 head broccoli (about 1 pound)
  • 1 tablespoon table salt plus more to taste
  • 2 tablespoons unsalted butter (¼ stick)
  • ¼ yellow onion diced (about 2 tablespoons)
  • 1 clove garlic minced
  • tablespoons all-purpose flour
  • cups heavy cream
  • ¼ cup low-sodium chicken broth or dry white wine
  • 2 pinches freshly grated nutmeg
  • 1 teaspoon dry mustard powder
  • 1 teaspoon crushed red pepper flakes
  • teaspoon freshly ground black pepper
  • ½ cup freshly grated Parmesan cheese
  • 1 cup freshly shredded sharp cheddar cheese

Recommended Equipment

Instructions

  • Preheat oven to 425°F and set the oven rack to the middle position. Spray a 2-quart (11×7-inch) casserole dish with nonstick cooking spray.

    Broccoli Cauliflower Casserole Recipe - (8)

  • Tear each slice of bread into 4 pieces.

    3 slices sandwich bread

  • Place the bread, butter, salt, and pepper in a food processor fitted with a metal blade. Process until coarse crumbs form, about ten 1-second pulses. Set aside.

    2 tablespoons unsalted butter, ¼ teaspoon table salt, ⅛ teaspoon freshly ground black pepper

    Broccoli Cauliflower Casserole Recipe - (9)

  • Trim the cauliflower and broccoli into ¾-inch florets. If using broccoli stalks, use only ½-inch of stalk next to the floret.

    1 head cauliflower, 1 head broccoli

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  • Fill a Dutch oven or stockpot two-thirds full with water. Add 1 tablespoon of salt and bring the water to a boil. Stir the boiling water and add the cauliflower and broccoli. Cook until the vegetables have a slight bite, 3-4 minutes, and drain.

    1 tablespoon table salt

    Broccoli Cauliflower Casserole Recipe - (11)

  • Heat a large skillet over medium heat. Add butter and cook just until foaming subsides.

    2 tablespoons unsalted butter

  • Add the onion and cook until softened and translucent, 2-3 minutes.

    ¼ yellow onion

  • Add the garlic and cook for 30 seconds.

    1 clove garlic

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  • Sprinkle the flour over the onion/garlic mixture; stir and cook for about 1 minute.

    1½ tablespoons all-purpose flour

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  • Reduce the heat to medium-low and whisk in the cream and broth (or wine). While stirring, bring to a boil.

    1¼ cups heavy cream, ¼ cup low-sodium chicken broth

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  • Reduce heat to low and add nutmeg, dry mustard, red pepper flakes, and black pepper. Cook (and stir) just until the mixture has thickened a little. Add salt to taste if needed.

    2 pinches freshly grated nutmeg, 1 teaspoon dry mustard powder, 1 teaspoon crushed red pepper flakes, ⅛ teaspoon freshly ground black pepper

    Broccoli Cauliflower Casserole Recipe - (15)

  • Add both cheeses and stir until cheese is melted.

    ½ cup freshly grated Parmesan cheese, 1 cup freshly shredded sharp cheddar cheese

    Broccoli Cauliflower Casserole Recipe - (16)

  • Remove from the heat and add the cauliflower and broccoli; stir gently to coat the vegetables

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  • Transfer cauliflower/broccoli mixture to the prepared dish and sprinkle with the breadcrumb topping.

  • Bake at 425°F for 15-20 minutes or until the sauce bubbles around the edges and the top is golden brown. Serve immediately.

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Last step! Don’t forget to show me a pic of what you made! Upload an image or tag me @thecookierookie on Instagram!

Becky’s tips

  • Note: If you prefer, you can use ¾ cups of store-bought Italian Bread Crumbs instead of dry bread.
  • You can also use frozen broccoli and cauliflower. If using, use one bag of each and cook in the microwave according to package instructions. Pat dry before stirring into the cheese sauce. I like the steam fresh kind best.

Storage:Store broccoli cauliflower casserole tightly covered in the refrigerator for up to 4 days.

Nutrition Information

Calories: 350kcal (18%) Carbohydrates: 19g (6%) Protein: 12g (24%) Fat: 27g (42%) Saturated Fat: 16g (100%) Polyunsaturated Fat: 1g Monounsaturated Fat: 7g Trans Fat: 0.2g Cholesterol: 77mg (26%) Sodium: 684mg (30%) Potassium: 647mg (18%) Fiber: 5g (21%) Sugar: 5g (6%) Vitamin A: 1466IU (29%) Vitamin C: 119mg (144%) Calcium: 264mg (26%) Iron: 2mg (11%)

Did You Make This?I want to see! Be sure to upload an image below & tag @thecookierookie on social media!

Broccoli Cauliflower Casserole Recipe - (19)

Broccoli Cauliflower Casserole Recipe - (20)

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How to Make Broccoli Cauliflower Casserole Step by Step

Prep: Preheat your oven to 425°F and set the oven rack to the middle position. Spray a 2-quart (11×7-inch) casserole dish with nonstick cooking spray.

Broccoli Cauliflower Casserole Recipe - (21)

Make the Topping: Tear 3 slices of sandwich bread into 4 pieces. Place the bread, 2 tablespoons of unsalted butter, ¼ teaspoon of table salt, and ⅛ teaspoon of ground black pepper in a food processor fitted with a metal blade. Process until coarse crumbs form, about ten 1-second pulses. Set aside.

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Chop the Veggies: Trim 1 head each of cauliflower and broccoli into ¾-inch florets. If using broccoli stalks, use only ½-inch of stalk next to the floret.

Broccoli Cauliflower Casserole Recipe - (23)

Boil the Veggies: Fill a Dutch oven or stockpot two-thirds full with water. Add 1 tablespoon of table salt and bring the water to a boil. Stir the boiling water and add the cauliflower and broccoli. Cook until the vegetables have a slight bite, 3-4 minutes, and drain.

Broccoli Cauliflower Casserole Recipe - (24)

Cook the Onion and Garlic: Heat a large skillet over medium heat. Add 2 tablespoons of unsalted butter and cook just until foaming subsides. Add ¼ of a diced yellow onion and cook until softened and translucent, 2-3 minutes, then add 1 minced clove of garlic and cook for 30 seconds.

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Make the Roux: Sprinkle 1½ tablespoons of all-purpose flour over the onion/garlic mixture; stir and cook for about 1 minute.

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Add the Liquids: Reduce the heat to medium-low and whisk in 1¼ cups of heavy cream and ¼ cup of low-sodium chicken broth (or wine). While stirring, bring to a boil.

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Season the Sauce: Reduce the heat to low and add 2 pinches of freshly grated nutmeg, 1 teaspoon of dry mustard powder, 1 teaspoon of crushed red pepper flakes, and ⅛ teaspoon of freshly ground black pepper. Cook (and stir) just until the mixture has thickened a little. Add salt to taste if needed.

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Add the Cheese: Add ½ cup of freshly grated Parmesan cheese and 1 cup of freshly shredded sharp cheddar cheese and stir until cheese is melted.

Broccoli Cauliflower Casserole Recipe - (29)

Stir in the Veggies: Remove from the heat and add the cauliflower and broccoli; stir gently to coat the vegetables.

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Bake the Casserole: Transfer the cauliflower/broccoli mixture to the prepared dish and sprinkle with the breadcrumb topping. Bake at 425°F for 15-20 minutes or until the sauce bubbles around the edges and the top is golden brown. Serve immediately.

Broccoli Cauliflower Casserole Recipe - (31)

Broccoli Cauliflower Casserole Recipe - (32)

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Broccoli Cauliflower Casserole Recipe - (2024)

FAQs

What is the mix between broccoli and cauliflower? ›

Romanesco, also known as broccoflower or Roman cauliflower, is a chartreuse, unique-looking vegetable prized for its appearance and mild flavor. It is sometimes assumed to be a hybrid between broccoli and cauliflower but is botanically different (although related).

What is the vegetable broccoli cauliflower cross? ›

Romanesco goes by various names, including Romanesco broccoli, fractal broccoli, or Roman cauliflower, though it's considered to be a hybrid between cauliflower and broccoli. And it's part of the Brassica genus (also known as cruciferous vegetables), just like Brussels sprouts, cabbage, and kale.

Is broccoli more nutritious than cauliflower? ›

While they are both very nutritious vegetables, broccoli has a higher vitamin content, specifically in vitamin K and C, than cauliflower and is specifically known to be great for eye health. Broccoli florets also provide more minerals and fiber as well as contains vitamin A that isn't in cauliflower.

What vegetables are similar to broccoli and cauliflower? ›

It may look like a hybrid between broccoli and cauliflower, but romanesco is actually more of a cousin. It's a type of brassica that's been bred to get its eccentric shape and nutty taste. When you eat romanesco, you're actually eating a flower.

Which is better for weight loss broccoli or cauliflower? ›

Cauliflowers are suitable for people trying to lose weight because of their low-calorie content. Although both the vegetables are high in manganese, broccoli has a higher manganese level. It improves bone density. Broccolis are therefore better suited for people with weak bones and arthritis.

Is it healthy to eat broccoli and cauliflower everyday? ›

They provide several health benefits. However consuming these both in excessive amount can have some side effects. Broccoli and cauliflower both are high in fiber they aid to digestion. But consuming these in larger quantity can cause bloating, excessive gas and discomfort.

Why is broccoli and cauliflower so expensive? ›

Further, due to inflation causing rising costs of farming inputs, farmers are unable to grow extra or discount products as they once could. One-pick Crops – Both broccoli and cauliflower are 'one-pick' crops. Meaning once they are ready, you cannot leave them in the field until they look better, they must be harvested.

What is the green vegetable that looks like cauliflower? ›

Romanesco is sometimes referred to as Romanesco broccoli or Romanesco cauliflower, but it is actually its own distinct variety. While it shares some characteristics with both broccoli and cauliflower, Romanesco has a nuttier, milder flavor than either of them.

How to cook broccoli cauliflower and other cruciferous vegetables for the best results? ›

High-heat roasting gets you the benefit of crispy edges quickly so that you don't overcook the insides. Be sure to leave plenty of space between whatever florets, pieces or leaves you're cooking, to avoid steaming rather than roasting.

What is the healthiest vegetable? ›

Here are 14 of the most nutrient-dense veggies available.
  1. Spinach. This leafy green tops the chart as one of the most nutrient-dense vegetables. ...
  2. Carrots. Carrots are packed with vitamin A, delivering 119% of the DV in just 1 cup (128 g) . ...
  3. Broccoli. ...
  4. Garlic. ...
  5. Brussels sprouts. ...
  6. Kale. ...
  7. Green peas. ...
  8. Swiss chard.

Which is more gassy cauliflower or broccoli? ›

“Cauliflower, like cabbage, is considered a high-FODMAP cruciferous veggie,” Volpe explains. “It is naturally high in raffinose (a poorly digested carbohydrate constituent) as well as in glucosinolates.” A less-gassy substitute for cauliflower, believe it or not, is broccoli.

Can dogs eat cauliflower? ›

Yes, dogs can eat cauliflower in moderation, either raw or cooked. Cauliflower is a source of dietary fiber, vitamin K, and vitamin C for dogs. Some dogs may dislike the slightly bitter taste of cauliflower. Avoid cauliflower with seasonings or oils, as they can cause upset stomach.

What vegetable is better than broccoli? ›

Spinach. Spinach contains many of the same health benefits as broccoli and kale. But it's also rich in phytochemicals. These cause the body to release hormones that make you feel full, which can be helpful for people who want to lose weight.

What is a white broccoli called? ›

What Is Cauliflower? Cauliflower is a member of the cruciferous vegetable family. It looks like a white version of broccoli, which is also a cruciferous vegetable. Like broccoli, cauliflower has tightly bunched heads called florets, which are connected by a thick core, often with a few light leaves surrounding it.

What is the group name for broccoli and cauliflower? ›

A member of the family of vegetables that includes broccoli, Brussels sprouts, cabbage, cauliflower, collard greens, kale, and turnips. These vegetables contain substances that may protect against cancer. Also called Brassica vegetable.

Is Romanesco healthier than broccoli? ›

According to The Land Connection, the nutritional profiles of broccoli and romanesco are fairly similar. Both are excellent sources of vitamins C and K, as well as dietary fiber.

Is cauliflower a hybrid of cabbage and broccoli? ›

The ancestry and family tree of cauliflower

Cauliflower originates from the Brassica Oleracea family of vegetables. Other vegetables, such as cabbage, broccoli, collard greens, and kohlrabi, are included here as well. Wild cabbage, or Brassica Oleracea, is the actual ancestor of these domesticated varieties.

Can you eat Romanesco raw? ›

Like broccoli, Romanesco can be eaten raw, but also holds up well under various cooking methods like stir frying or roasting in an oven. As the florets heat up, they can become surprisingly sweet, making Romanesco a perfect addition to curries and other spicy dishes.

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