Looking for an easy side dish? Try Cauliflower Broccoli Casserole, with browned butter, onions, and cheddar cheese. It’s yummy and serves 8!
Looking for an easy side dish? Try Cauliflower Broccoli Casserole, with browned butter, onions, and cheddar cheese. It's yummy and serves 8!

Over 40 years ago, a dear friend of mine gave me her recipe for a broccoli casserole which is absolutely delicious. Over time I’ve tinkered with her recipe and adapted it by changing some of the original ingredients (and adding some, too).

This new recipe for cauliflower broccoli casserole is the one I am sharing with you today. It is really simple to make, tastes wonderful and serves 8. It also stores well for several days in the fridge for leftovers!

I really hope you enjoy this side dish, and appreciate how truly easy it is to prepare, because you will use frozen broccoli and cauliflower florets for convenience of preparation! Here’s how to make this delicious vegetable casserole.

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Prepare The Vegetables

For this recipe you will need one 12 oz. bag of frozen broccoli florets and a 12 oz. bag of frozen cauliflower florets. Using frozen veggies is a great time saver because the veggies are already cut in bite sized pieces!

Pour the contents of both bags into 2 cups of boiling water, and cook them for 6-7 minutes. When they have finished cooking, drain them well and set them aside until later.

Bags of frozen broccoli and cauliflower florets are used for this casserole.Frozen cauliflower and broccoli are cooked in boiling water in pan.

Now it’s time to cook the onions. Melt a stick of butter (½ cup) in a skillet, until the butter begins to get foamy and browns slightly.

Add the chopped onions and cook, stirring occasionally, for 3-4 minutes until the onions begin to brown slightly and become tender. Remove the skillet from the heat.

Chopped onions are cooked until tender in browned butter.

Time To Make The Cauliflower Broccoli Casserole

Mix two beaten eggs and mayonnaise in a small bowl until they are well combined (I use a fork to do this). Pour this mixture into a large mixing bowl.

Beaten eggs are combined with mayonnaise in a small bowl.

Add the cooked cauliflower and broccoli, butter and onions, cream of mushroom soup, curry powder, salt, pepper and grated cheddar cheese to the egg mixture.

Stir all the ingredients together until everything is completely combined and covered with the “sauce”.

All ingredients for the vegetable casserole placed in a large mixing bowl.Ingredients for the cauliflower broccoli casserole are combined for baking.

Spray or grease a 7½” x11″ baking dish OR a 9″ x 13″ baking dish on the bottom and sides. Transfer the cauliflower broccoli casserole mixture into the baking pan, and spread to evenly distribute it in the dish.

The cauliflower broccoli casserole is spread in a baking dish.

Time To Bake The Cauliflower Broccoli Casserole

Sprinkle the top of the casserole with bread crumbs. Bake the casserole (uncovered) in a preheated 375°F. oven (on a middle rack) for 25-28 minutes.

When it’s done, the cauliflower broccoli casserole should be bubbling around the edges, and the top should be golden brown.

Bread crumbs are sprinkled on top of the casserole before baking.

 Transfer the baking dish to a wire rack. Let the casserole cool for 2-3 minutes before dipping it out of the dish and serving.  

Baked cauliflower broccoli casserole rests on wire rack to cool 2-3 minutes.

Time To Enjoy This Veggie Casserole

This veggie casserole can easily be served as a side dish for a variety of main dishes. After scooping it up and out of the baking dish, it may not look like a million dollar dish, but trust me… it is DELICIOUS!

We enjoyed it this time paired with baked chicken thighs and legs, along with homemade cloverleaf dinner rolls (with honey) on the side. YUM!

A serving of the veggie casserole with chicken and a dinner roll on the side.

I hope you have the opportunity to try this delicious vegetable casserole. Store any leftovers in an airtight container in the refrigerator for up to 3-4 days. They can be easily reheated in the microwave and enjoyed with another meal.

Thank you for stopping by, and I invite you to come back again soon for more family-friendly recipes. Take care, may God bless you, and I hope you have a GREAT day!

Looking For More VEGETABLE Recipes?

You can find ALL of my recipes in the Recipe Index, which is located at the top of the page. I have LOTS of delicious veggie recipes you might enjoy, including:

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Recipe adapted from : Elnora Hall


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Cauliflower Broccoli Casserole
Prep Time
15 mins
Cook Time
25 mins
Total Time
40 mins

Looking for an easy side dish? Try Cauliflower Broccoli Casserole, with browned butter, onions, and cheddar cheese. It's yummy and serves 8!

Category: Vegetable Dish
Cuisine: American
Keyword: cauliflower broccoli caserole
Servings: 8
Calories Per Serving: 248 kcal
Author: JB @ The Grateful Girl Cooks!
  • 12 ounces frozen cauliflower florets =1 bag
  • 12 ounces frozen broccoli florets = 1 bag
  • ½ cup butter = 1 stick
  • 1 medium yellow onion chopped
  • 2 large eggs lightly beaten
  • ¼ cup light mayonnaise
  • 10.5 ounces cream of mushroom soup = 1 can
  • 1 cup grated cheddar cheese medium or sharp
  • ½ teaspoon curry powder
  • ½ teaspoon salt
  • ¼ teaspoon black pepper
  1. Preheat oven to 375°F. Spray or grease a 7½" x11" baking dish OR a 9" x 13" baking dish on the bottom and sides.

  2. Place frozen cauliflower and broccoli in 2 cups of boiling water in a pan; cook for 6-7 minutes. Drain well; set aside.

  3. Melt butter in a skillet, until foamy/slightly browned. Add onions; cook, stirring often for 3-4 minutes until tender. Remove from heat.

  4. Mix eggs and mayonnaise in a large bowl until well combined. Add cauliflower and broccoli, butter/onions, mushroom soup, curry powder, salt, pepper and cheese. Stir until combined; transfer to baking dish. Sprinkle with bread crumbs.

  5. Bake uncovered at 375°F. for 25-28 minutes on a middle rack. When done, it should be bubbly around edges and golden brown on top. Transfer baking dish to a wire rack; let cool 2-3 minutes before serving.

Nutrition Facts
Cauliflower Broccoli Casserole
Amount Per Serving (1 (1/8 of total))
Calories 248 Calories from Fat 180
% Daily Value*
Fat 20g31%
Saturated Fat 11g69%
Trans Fat 0.5g
Polyunsaturated Fat 2g
Monounsaturated Fat 5g
Cholesterol 94mg31%
Sodium 696mg30%
Potassium 365mg10%
Carbohydrates 9g3%
Fiber 2g8%
Sugar 2g2%
Protein 9g18%
Vitamin A 835IU17%
Vitamin C 59mg72%
Calcium 146mg15%
Iron 1mg6%
* Percent Daily Values are based on a 2000 calorie diet.

Here’s one more to pin on your Pinterest boards!Looking for an easy side dish? Try Cauliflower Broccoli Casserole, with browned butter, onions, and cheddar cheese. It's yummy and serves 8!

Cauliflower Broccoli CasseroleCauliflower Broccoli Casserole

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