Slow Cooker Broccoli and Cauliflower Casserole


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Easy, cheesy, yet hearty, this Slow Cooker Broccoli and Cauliflower Casserole is a tasty side for countless meals or a satisfying meatless entrée. From a simple weeknight dinner to your holiday table, this recipe often uses on-hand ingredients and no condensed canned soups.

Cheesy casseroles always top the list of favorite comfort foods. So if they top your list too, you will love these Slow Cooker Chicken Enchilada Casserole and Slow Cooker Cheesy Broccoli Chicken recipes.

cooked cauliflower and broccoli casserole in slow cooker

Why this recipe works

This recipe is the perfect blend of both vegetables and cheesy creaminess. Not so cheesy that the vegetables are drowned in a sea of cheese but just enough to hide them from your most pickiest of eaters.

Plus, there’s the bonus of not only being kid-friendly but this slow cooker broccoli and cauliflower casserole also makes a beautiful addition to holiday meals.

Ingredients for broccoli and cauliflower casserole on a table with text labels.

Recipe Ingredients

  • Cauliflower and Broccoli – We used frozen florets to have nice large pieces. Be sure to knock off any clinging ice crystals to reduce any unnecessary moisture.
  • Bacon – Cook the entire pound of bacon to desired crispiness, then roughly chop.
  • Cream cheese – We prefer Philadelphia brand for the best flavor and creaminess. This will make a yummy cream sauce.
  • Shredded cheeses – For bolder, richer flavor, we used pepper Jack, white cheddar, and cheddar cheeses.
  • Seasonings – Fresh minced garlic, black pepper, and Everything Bagel seasoning.
  • French fried onions – These are no strangers to casseroles; they’re perfect for giving that extra crunch to each bite. We are using these instead of bread crumbs.
  • Other ingredients– diced red onion and sour cream to add to the flavor and texture of the whole dish and green onions for garnishing.

Step-by-Step Directions

steps on how to add ingredient for cauliflower casserole to a crockpot

Step One – Cook the bacon and set it aside. Add half of both the broccoli florets and cauliflower florets to the crockpot and place the cubed cream cheese on top.

Step Two – Add half of the now combined shredded cheeses and the diced red onion.

Step Three – Sprinkle half of the crumbled bacon, dollops of the sour cream, and freshly cracked peppercorn.

Step Four – Smooth the mixture out as evenly as possible.

Step Five – Create the next layer by adding the remaining broccoli and cauliflower, next the bacon, and finally the cheeses.

Step Six – Sprinkle the Everything Bagel seasoning over the top—cover and cook on LOW for 4 hours or on HIGH for 2.5 hours.

done cooking cauliflower casserole in slow cooker

What can I serve with this?

3 bowls of cauliflower and broccoli casserole

Recipe FAQs and Variations

Is this low carb or keto?

Broccoli and cauliflower casserole is keto-friendly if you omit the French fried onions.

Is this gluten-free?

This recipe is gluten-free if you do not use the French fried onions.

Can I make broccoli cauliflower casserole vegetarian?

Yes, simply omit the bacon or use your favorite bacon alternative.

Can I use fresh vegetables instead of frozen?

You’ll want about four cups of both fresh broccoli (about two heads) and fresh cauliflower (one large head).

Can I substitute the pepper Jack cheese?

Absolutely! Use your favorite cheeses. Monterrey Jack, Colby Jack, and Longhorn Cheddar would all be delicious in this casserole. We don’t recommend using pre-grated cheeses; they tend to alter the dish’s flavor.

What other vegetables can I add to this?

You’re limited only by your imagination. Cut carrots, quartered Brussels sprouts, fresh green beans, trimmed asparagus, diced leeks, and even sliced zucchini would work well.

Can I freeze this?

We do not recommend freezing this recipe. Once it thawed, it might taste soggy and grainy.

How long will leftovers last?

Adequately covered and stored, this recipe will remain delicious for 3-4 days in the fridge.

bowl of broccoli and cauliflower casserole

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done cooking cauliflower casserole in slow cooker

Slow Cooker Broccoli and Cauliflower Casserole

5 from 2 votes
Prep Time: 25 minutes
Cook Time: 4 hours
Total Time: 4 hours 25 minutes
Servings: 8
A tasty side dish with broccoli and cauliflower and plenty of cheese and flavorful ingredients.

Ingredients 
 

  • 1 lb. bacon
  • 4 oz. block cheddar cheese
  • 4 oz. block white cheddar cheese
  • 4 oz. block pepper jack cheese
  • 16 oz. frozen cauliflower florets
  • 16 oz. frozen broccoli florets
  • 8 oz cream cheese
  • 1 red onion, diced
  • 1/2 cup sour cream
  • 1 tsp. minced garlic
  • 1 tsp. black pepper
  • 1.5 tsp. Everything Bagel seasoning
  • 1 cup green onions, diced
  • 2 cups French fried onions

Instructions 

  • Brown and drain the bacon. Roughly chop
  • While bacon is cooking, shred the cheese blocks and combine in a bowl. Dice the red onions and set aside ¼ cup for topping. Mince the garlic.
  • Add ½ the cauliflower and broccoli florets to the crock pot.
  • Next, add cubed cream cheese, diced red onion, half the shredded cheese, and half the crumbled bacon. Add sour cream, garlic, and black pepper and spread evenly.
  • Next, top with remaining cauliflower, Broccoli, shredded cheese, and bacon. Sprinkle ½ tbsp of Everything Bagel seasoning evenly over the top.
  • Cover and cook on low for 4 hours or high for 2.5 hours.
  • Stir and top with chopped Green onions and French fried onions. Enjoy!

Notes

Can I use fresh vegetables instead?
You’ll want about 4 cups of both broccoli (about two heads) and cauliflower (one large head).
Can I freeze this?
We do not recommend freezing this recipe. Once it thawed, it might tasty soggy and grainy.
What other vegetables can I add to this?
You’re limited only by your imagination. Cut carrots, quartered Brussels sprouts, fresh green beans, trimmed asparagus, diced leeks, and even sliced zucchini would work well.
Can I substitute pepper jack cheese?
Absolutely! Use your favorite cheeses. Monterrey Jack, Colby Jack, and Longhorn Cheddar would all be delicious in this casserole. We don’t recommend using pre-grated cheeses, they tend to alter the flavor of the dish.

Nutrition

Calories: 660kcal | Carbohydrates: 18g | Protein: 23g | Fat: 56g | Saturated Fat: 26g | Polyunsaturated Fat: 5g | Monounsaturated Fat: 17g | Trans Fat: 1g | Cholesterol: 118mg | Sodium: 934mg | Potassium: 619mg | Fiber: 3g | Sugar: 4g | Vitamin A: 1364IU | Vitamin C: 82mg | Calcium: 410mg | Iron: 2mg

Nutrition info is auto-generated. This information is an estimate; if you are on a special diet, please use your own calculations.

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6 Comments

  1. Nancy says:

    Can I add chicken to this to make it a complete meal?

    1. Sarah Olson says:

      It should work fine as long as the chicken is thawed.

  2. John says:

    After cooking how long will it keep on warm or must you serve it straight away

    1. Sarah Olson says:

      I would serve within an hour for this one.

  3. Amy says:

    5 stars
    My entire family loved this recipe!

  4. Anonymous says:

    My family absolutely loved this recipe! We are always looking for a way to make vegetables more interesting, and this dish is a winner!