Broccoli Cauliflower Casserole Bake

Broccoli Cauliflower Casserole Bake is a low-carb, healthy take on your favorite comfort food that the whole family will enjoy. The casserole is creamy, cheesy and the perfect side dish for dinner or the holidays. It requires less than 15 minutes of prep!

broccoli cauliflower bake in a white casserole dish

Are you looking for hearty comfort foods? Cheesy casseroles are perfect during the fall and winter seasons. This recipe takes a classic broccoli casserole, adds cauliflower and lightens it up by making it lower carb and just as delicious!

This low carb, cheesy broccoli cauliflower bake is the perfect side dish for Thanksgiving dinner, dinner parties or weeknight meals. It’s keto friendly but the entire family will love it.

Ingredients You Need

ingredients for broccoli and cauliflower casserole bake
  • Broccoli and Cauliflower: You can use all broccoli or all cauliflower instead of a mix, if desired.
  • Butter: You can use ghee instead.
  • Onion and Garlic: These add flavor so don’t omit.
  • Cream Cheese: This helps cream the cheesy creamy texture. You can substitute for mascarpone or even cottage cheese, but the texture and flavor of the casserole will be different.
  • Heavy Cream: You can use whole milk instead, if needed.
  • Dijon Mustard: Adds flavor.
  • Cheese: The combo of mozzarella cheese and white cheddar cheese makes this dish have the best flavor. The cheese also helps make the dish extra creamy. You can swap out with another type of cheese, but it may change the flavor.
mixing together ingredients for the casserole in a pan

Recipe Tips

  • Save time by chopping the vegetables in advance.
  • You can save more time by blanching the broccoli and cauliflower ahead of time.
  • Other toppings: You can add bread crumbs to the top just prior to baking if you like casserole with breadcrumbs.
  • You can bake it in advance and reheat just prior to serving. To reheat, cover with foil and heat in the oven at 350 degrees F. Reheat for 20 to 25 minutes or until reheated through.
  • To freeze, we recommend dividing the uncooked casserole into freezer safe containers, making sure it is wrapped well or has an airtight cover. Store for up to 3 months. Remove from the freezer and bake the casserole at 400 degrees for 30 to 35 minutes or until it’s cooked through. It may take a little longer since it’s frozen.
broccoli cauliflower casserole ingredients in a casserole dish before going into the oven

This recipe has the same flavor as a classic broccoli cauliflower casserole but without the extra carbs. Make this for dinner throughout the week or serve it at Thanksgiving.

a spoon with a scoop of broccoli cauliflower casserole on it

Other Easy Casserole Recipes

broccoli cauliflower bake in a white casserole dish

Broccoli Cauliflower Casserole

Yield: 5
Prep Time: 10 mins
Cook Time: 30 mins
Total Time: 40 mins
This is a low-carb twist on your favorite comfort food that the whole family will enjoy. It's keto friendly too!
5 from 5 votes

Ingredients 

  • 3 cups broccoli florets
  • 2 cups cauliflower florets
  • 1 tablespoon unsalted butter or ghee
  • 1 medium onion,, diced
  • 2 cloves garlic,, minced
  • 6 ounces cream cheese, cubed, at room temperature
  • 1/3 cup heavy cream
  • 1 teaspoon dijon mustard
  • 1/2 teaspoon salt
  • 1/2 teaspoon ground black pepper
  • 8 ounces shredded white cheddar cheese,, divided
  • 3 ounces mozzarella cheese

Instructions

  • Preheat oven to 400 degrees F. Butter an 8×8 casserole dish and set aside.
  • Bring a large pot of water to a rolling boil; add the broccoli and cauliflower and blanch for 1 minute, then drain well.
  • Melt butter in a deep skillet over medium heat. Saute onion 3-4 minutes, then add the garlic.
  • Stir in the cream cheese until melted, and then stir in the heavy cream, mustard, salt, pepper, half of the cheddar, and the mozzarella. Once the cheese is melted, stir in the broccoli & cauliflower.
  • Pour the contents into the prepared dish and top with the remaining cheddar. Bake uncovered 20-25 minutes, until cheese is bubbling and golden.

Notes

SUBSTITUTIONS
  • You can use all broccoli or all cauliflower instead of a mix.
  • Cream Cheese: This helps give this dish the creamy cheesy texture. You can substitute for mascarpone or even cottage cheese, but the texture and flavor of the casserole will be different.
  • Heavy Cream: Use whole milk instead, if needed.
STORAGE:
  • Store in the refrigerator covered for up to 3 days. 
  • To freeze, store the uncooked casserole in a freezer safe container, making sure it is wrapped well or has an airtight cover. Store for up to 3 months. Then bake the casserole at 400 degrees for 30 to 35 minutes, or until cooked through. 
  • To reheat, cover with foil and heat in the oven at 350 degrees F. Reheat for 20 to 25 minutes or until heated through. 

Nutrition

Calories: 355kcal, Carbohydrates: 9.4g, Protein: 15.3g, Fat: 29g, Saturated Fat: 17g, Cholesterol: 95mg, Sodium: 570mg, Potassium: 405mg, Fiber: 3g, Sugar: 4g
Course: Main Course, Side Dish
Cuisine: American
If you try this recipe, don’t forget to leave a review below or share a photo and tag @spoonfulofflavor on Instagram.

This recipe was originally published in November 2018 and was updated in October 2020 with new process photos, tips and more.

4 comments on “Broccoli Cauliflower Casserole Bake”

  1. I love this casserole! It turned out so perfectly cheesy and delicious. I had zero trouble getting anyone to eat their veggies!

  2. So creamy and delicious! It was a hit at our family dinner.

  3. this was so yummy and now I finally got my non vegetable eaters to like broccoli this is a great recipe thank you!

  4. This is a super yummy way to get those veggies in!

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