Keto Broccoli Cauliflower Rice Casserole

This keto broccoli cauliflower rice casserole is a creamy, cheesy low carb side dish made with fresh broccoli, cauliflower rice, cheddar cheese, Parmesan, cream cheese, and a simple homemade cheese sauce.

If you love classic broccoli rice casserole but want to skip the regular rice, this keto broccoli rice casserole delivers all that cheesy comfort with cauliflower rice instead.

It is naturally gluten free, packed with vegetables, and has just 4.6 grams of net carbs per serving.

Best of all, there is no canned condensed soup needed. The rich cheese sauce is made from scratch with heavy cream, butter, cream cheese, Parmesan, cheddar cheese, and simple seasonings.

Serve this cheesy broccoli cauliflower rice casserole alongside chicken, beef, pork, or your favorite keto main dish.

For a heartier meal you can try our keto chicken broccoli cauliflower rice casserole.

Be sure to check out our round-up of keto casseroles for more tasty options.

Keto Broccoli Rice Casserole With Cauliflower Rice

Cauliflower rice is one of my favorite ways to remake traditional rice dishes into keto friendly recipes. In this casserole, it works especially well because it soaks up the creamy cheese sauce while keeping the dish low in carbs.

Fresh broccoli adds plenty of texture and color, while cheddar, Parmesan, and cream cheese create the rich flavor you expect from a broccoli cheese casserole.

The key to getting the texture just right is removing as much moisture as possible from both the cauliflower rice and broccoli before combining them with the sauce.

Why You'll Love This Broccoli Cauliflower Rice Casserole

This recipe gives you the familiar flavors of broccoli cheese rice casserole without using traditional rice.

It is creamy and cheesy without relying on canned soup, and using packaged frozen cauliflower rice makes preparation much easier.

It also works for more than weeknight dinners. This low carb broccoli rice casserole is a great option for holiday meals, family dinners, potlucks, or anytime you need an easy keto vegetable side dish.

If you want a low-carb side dish for holiday dinners or just a healthy keto-friendly way to get more veggies in your diet, give this keto casserole a try! I promise you won't regret it!

This casserole has quickly become one of my favorite low-carb side dishes! My family loves it when I make homemade cheesy dishes, and this recipe was no exception!

It was all they could talk about at the table!

Ingredients You'll Need

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The base of this casserole is fresh broccoli and frozen cauliflower rice. I prefer using fresh broccoli because it allows you to cook the florets just until crisp tender before they go into the oven.

For the homemade cheese sauce, you will need heavy cream, butter, cream cheese, Parmesan cheese, shredded cheddar cheese, onion, garlic powder, onion powder, smoked paprika, dry mustard powder, salt, and black pepper.

The combination creates a rich, creamy sauce that coats the broccoli and cauliflower rice without needing flour or a canned condensed soup.

The complete measurements are included in the recipe card below.

How To Make Keto Broccoli Cauliflower Rice Casserole

Start by preparing the homemade cheese sauce. Cook the chopped onion in butter until soft and translucent, then add the seasonings and heavy cream. Whisk until the mixture begins to thicken.

Add the softened cream cheese, Parmesan, and most of the shredded cheddar cheese. Stir until the cheeses have completely melted and the sauce is smooth.

Prepare the frozen cauliflower rice according to the package directions. Once cooked, drain it very well. I like to place it in a fine mesh strainer and press gently with a spatula to remove as much excess liquid as possible.

Next, blanch the fresh broccoli florets for only a few minutes. You want them crisp tender since they will continue cooking in the oven. Drain them thoroughly.

Combine the broccoli, cauliflower rice, and cheese sauce, then transfer everything to the prepared casserole dish. Sprinkle the remaining cheddar cheese over the top and bake until hot, bubbly, and lightly browned.

How To Keep Cauliflower Rice Casserole From Getting Watery

Removing excess moisture is one of the most important steps when making a cauliflower rice broccoli casserole.

Frozen cauliflower releases quite a bit of water when it cooks. After preparing the cauliflower rice according to the package instructions, drain it thoroughly before adding it to the casserole.

The broccoli should also be well drained after blanching. Since both vegetables continue to release some moisture while baking, starting with properly drained vegetables gives you a much creamier finished casserole.

Also avoid overcooking the broccoli before it goes into the oven. Two to three minutes is enough to make it slightly tender while still allowing it to hold its texture during baking.

Can I Use Fresh Cauliflower Rice?

Yes. If you prefer fresh cauliflower rice, you can make your own rather than using frozen packaged cauliflower rice.

Use our keto cauliflower rice recipe as a guide, but omit the seasonings since the casserole already includes plenty of flavor from the homemade cheese sauce.

Whether you use fresh or frozen cauliflower rice, make sure it does not contain excess moisture before adding it to the casserole.

Can I Use Frozen Broccoli?

I prefer fresh broccoli for this recipe because it makes it easier to control the texture and moisture level.

If you want to experiment with frozen broccoli, be especially careful to remove excess moisture before adding it to the casserole. Frozen vegetables can release additional liquid as they bake.

For the most consistent results, I recommend preparing the recipe with fresh broccoli as written.

Can I Add Chicken?

Absolutely. Adding cooked chicken is an easy way to turn this keto broccoli cauliflower rice casserole from a side dish into a more substantial meal.

In fact, I already created this recipe for you, just visit our keto chicken broccoli cauliflower rice for the full recipe. 

What To Serve With Keto Broccoli Rice Casserole

This cheesy cauliflower rice and broccoli casserole pairs beautifully with chicken, pork, steak, meatloaf, or ham.

It is also a great low carb side dish for holiday dinners when you want something creamy and satisfying without traditional carbs.

Because the flavors are simple and familiar, it works with almost any keto main dish.

Storing Leftovers

Store leftover broccoli cauliflower rice casserole in a covered container in the refrigerator for up to three days.

The casserole can also be frozen for up to three weeks. Allow leftovers to cool before transferring them to a freezer safe container.

When reheating, heat only until warmed through so the broccoli does not become overly soft.

More Keto Casserole Recipes

If you love easy low carb comfort food like this keto broccoli rice casserole, be sure to visit our collection of keto main dish casseroles for more family friendly options.

You can also check out our keto cauliflower rice recipe if you would rather make the cauliflower rice from scratch.

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It's my prayer that these keto cookbooks will help make keto a delicious breeze for you.

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