Broccoli Cauliflower Casserole is the ultimate low carb side dish! Packed with flavor and topped with bubbly cheese, you'll want this at your dinner table every night of the week.

Broccoli Cauliflower Casserole in a white scalloped edge casserole dish

Why This Is The Perfect Side Dish

Fast. Ready in under 30 minutes with the help of your air fryer.
Easy. A simple pour and cook recipe.
Low Carb. Only net carbs per serving.
Gluten Free. A bubbly cheese topping replaces a traditional cracker or breadcrumb topping.
Vegetarian. A tasty vegetarian side dish that is flavorful and filling.

Ingredients You'll Need

If you're living a low carb lifestyle, you likely already have all of the ingredients in your kitchen. They're all delightfully low carb and great for hitting your daily macros.

Broccoli Florets
Cauliflower Florets
Onion
Cheddar Cheese
Cream Cheese
Heavy Cream
Salt
Pepper

Do You Put Eggs In Broccoli Casserole?

Some people choose to put a scrambled egg in their Broccoli Cauliflower Casserole to thicken the consistency. I find that this makes it taste more like a frittata, which is equally tasty but feels more like a Vegetarian main course than a side dish.

How To Make Broccoli Cauliflower Casserole

From busy weeknight dinners to holiday meals, this Broccoli Cauliflower Casserole is a quick and easy side dish that the whole family will love. Follow the easy instructions below for a tasty low carb dish that turns out perfect every time.

Spray a heat-safe casserole dish that fits in your air fryer basket with nonstick spray.
In a bowl, stir together the softened cream cheese, heavy cream, salt, pepper, and cheddar cheese.
Toss the diced onion and broccoli and cauliflower florets in the creamy sauce.
Place the casserole dish in the air fryer basket and air fry at 375F for 8 minutes, stirring halfway through.
Remove the air fryer basket and cover the broccoli and cauliflower with more cheese.
Continue to air fry at 375F for an additional 2 minutes.
Remove the Broccoli Cauliflower Casserole from the air fryer and serve.

Variations

Make it meaty. Add a little precooked rotisserie chicken or cubed ham to increase the amount of protein per serving.
Add more veggies. If you love veggies and want to add more flavor variety to this dish, you can include zucchini, yellow squash, carrots, or eggplant. These modifications will impact the nutritional facts per serving.
Switch up the sauce. If you're not a fan of sharp cheddar cheese, you can pour some of my keto alfredo sauce over the top of the cauliflower and broccoli and sprinkle parmesan to finish.

How Do You Make Broccoli Casserole With Ritz Crackers?

If you're not concerned about carbs or gluten, you can always go the traditional route and top your Broccoli Cauliflower Casserole with Ritz crackers.

To make this modification, crush up a sleeve of Ritz crackers in a ziptop bag. Pour 2 tablespoons of melted butter into the bag and shake until the crackers are covered in butter. Sprinkle the crackers over the top of the broccoli and cauliflower and top with cheese. Cook according to the directions below.

What To Serve With It

This Broccoli Cauliflower Casserole is the perfect side dish for almost any meal. It can make even the most basic protein into a complete meal. Here are a few of my favorite things to serve with it:

How Long Does It Last?

Broccoli Cauliflower Casserole makes wonderful leftovers. Since it pairs so well with so many dishes, saving half for another meal is never a bad idea. For the best texture and flavor, store any leftovers in an airtight container in the refrigerator and enjoy them within 3-4 days.

Can You Freeze Broccoli Gratin?

Yes, you technically can freeze this broccoli side dish. Make sure you place it in a freezer-safe container to avoid freezer burn.

A few hours before you're ready to eat your broccoli casserole, remove it from the freezer and place it in the refrigerator to begin defrosting. When it's time to warm it up, place the thawed casserole back in the air fryer and cook at 350F for 3-4 minutes or until it is warmed through.

More Low Carb Side Dishes

Are you tired of the same old boring keto side dishes? Try out some of these tasty side dishes that are packed with flavor and low in carbs:

Broccoli Cauliflower Casserole Pin with text overlay

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