Ground Beef Casserole with Cauliflower Rice: Easy Cheesy Low-Carb Dinner

Looking for a comforting, easy dinner that comes together without a lot of fuss? This Ground Beef Casserole with Cauliflower Rice is a delicious weeknight meal made with seasoned ground beef, tender spinach, creamy cauliflower rice, and plenty of melted Italian cheese.

Everything is combined in one baking dish and baked until hot, bubbly, and golden. Sour cream adds a rich, creamy texture, while garlic, Italian seasoning, paprika, and dried basil bring plenty of flavor to every bite.

This casserole is a wonderful way to enjoy classic comfort food with cauliflower rice instead of traditional rice. It’s hearty, satisfying, family-friendly, and easy to customize with your favorite vegetables or protein.

With just 15 minutes of prep time and 25 minutes of baking, this Ground Beef Casserole with Cauliflower Rice is a great recipe to keep in your regular dinner rotation.

Why You’ll Love This Ground Beef Casserole

• Easy weeknight dinner: Simple ingredients and straightforward steps make this casserole easy to prepare.
• Creamy and cheesy: Sour cream and Italian blend cheese create a rich, comforting texture.
• Packed with flavor: Ground beef, garlic, onion, Italian seasoning, and paprika make every bite delicious.
• A great cauliflower rice recipe: Frozen cauliflower rice makes preparation convenient and keeps the dish simple.
• Easy to customize: Add extra vegetables or swap the ground beef for turkey, chicken, or sausage.

Ingredients You’ll Need

• Olive oil (1 tablespoon): Used to sauté the onion and garlic and prevent sticking.
• Yellow onion (1 small, diced): Adds sweetness and savory flavor to the beef mixture.
• Garlic (3 cloves, minced): Gives the casserole a delicious aromatic base.
• Lean ground beef (1 pound): Provides the hearty, savory protein.
• Italian seasoning (1 teaspoon): Adds a blend of herbs that complements the beef and cheese.
• Sweet paprika (½ teaspoon): Brings mild warmth and color.
• Salt and freshly ground black pepper: Season the beef mixture to taste.
• Fresh baby spinach (6 ounces): Adds color and tender leafy greens.
• Frozen cauliflower rice (10 ounces, cooked): Replaces traditional rice and creates the base of the casserole.
• Sour cream (1 cup): Adds creaminess and a slight tang. Plain yogurt can also be used.
• Butter (1 tablespoon, room temperature): Helps create a rich, smooth cauliflower rice mixture.
• Dried basil (½ teaspoon): Adds a gentle herbal flavor.
• Milk (2–3 tablespoons, if needed): Helps loosen the cauliflower mixture if it feels too thick.
• Shredded Italian blend cheese (8 ounces): Melts over the casserole to create a delicious cheesy topping.

Equipment Needed

• Large skillet
• 9 × 13-inch baking dish
• Cutting board and knife
• Measuring cups and spoons
• Wooden spoon or spatula
• Colander or strainer, if needed
• Oven

How to Make Ground Beef Casserole with Cauliflower Rice

1. Preheat the Oven

Preheat your oven to 375°F (190°C).

Lightly grease a 9 × 13-inch baking dish if needed and set it aside.

2. Sauté the Onion

Heat the olive oil in a large skillet over medium-high heat.

Add the diced yellow onion and cook for approximately 2 minutes, stirring occasionally, until it begins to soften.

3. Add the Garlic

Stir in the minced garlic and cook for about 20 seconds, just until fragrant.

Be careful not to let the garlic burn, as it can become bitter.

4. Brown the Ground Beef

Add the lean ground beef to the skillet along with the Italian seasoning, sweet paprika, salt, and freshly ground black pepper.

Cook, breaking the beef apart with a spoon, until browned and fully cooked.

5. Add the Spinach

Stir the fresh baby spinach into the beef mixture.

Cook for approximately 1 minute, until the spinach wilts and blends into the beef.

Drain any excess liquid from the skillet, then set the beef mixture aside.

6. Prepare the Creamy Cauliflower Rice

Add the cooked cauliflower rice to the 9 × 13-inch baking dish.

Stir in the sour cream, room-temperature butter, and dried basil until the mixture is creamy and evenly combined.

If the mixture seems too thick, add 2–3 tablespoons of milk as needed to loosen it.

7. Combine the Ingredients

Add the cooked ground beef and spinach mixture to the cauliflower rice.

Stir everything together until the beef, vegetables, and creamy cauliflower rice are evenly distributed throughout the baking dish.

8. Add the Cheese

Sprinkle the shredded Italian blend cheese evenly over the top of the casserole.

Make sure the surface is covered so you get plenty of melted cheese in every serving.

9. Bake Until Bubbly

Place the uncovered baking dish in the preheated oven.

Bake for 22–25 minutes, or until the casserole is hot and bubbly and the cheese is completely melted.

Leaving the dish uncovered allows the cheese to melt and bubble beautifully.

10. Rest and Serve

Remove the casserole from the oven and let it rest for 7–10 minutes before serving.

This resting time helps the casserole settle and makes it easier to scoop into portions.

Serve warm and enjoy!

Tips for the Best Ground Beef Casserole

• Cook the cauliflower rice first: Make sure the frozen cauliflower rice is cooked before mixing it with the other ingredients.
• Drain excess liquid: Remove extra liquid from the cooked beef mixture to help prevent a watery casserole.
• Use lean ground beef: Lean beef helps reduce excess grease while still providing plenty of flavor.
• Don’t overcook the garlic: It only needs about 20 seconds to become fragrant.
• Adjust the creaminess: Add milk gradually if the cauliflower rice mixture seems too thick.
• Bake uncovered: This allows the cheese to melt and bubble without trapping excess moisture.
• Let it rest: Give the casserole 7–10 minutes to settle before serving for the best texture.
• Season to taste: Adjust the salt and black pepper according to your preference.

Recipe Variations

Ground Turkey Cauliflower Rice Casserole

Replace the ground beef with ground turkey for a lighter variation. Follow the same cooking instructions, making sure the turkey is fully cooked before adding the spinach.

Chicken Cauliflower Rice Casserole

Use cooked ground chicken or finely chopped cooked chicken instead of ground beef. The creamy cauliflower rice, spinach, and Italian cheese pair wonderfully with chicken.

Sausage and Cauliflower Rice Casserole

For a bolder, savory flavor, substitute Italian sausage for the ground beef. Choose mild or spicy sausage depending on your preference.

Cauliflower Rice Casserole with Extra Vegetables

Add peas, diced carrots, or other favorite vegetables to the beef mixture. Cook them until tender before combining everything in the baking dish.

Extra Cheesy Ground Beef Casserole

For an even cheesier casserole, experiment with a combination of mozzarella, cheddar, or Parmesan alongside the Italian blend cheese.

What to Serve with Ground Beef Casserole

This casserole is hearty enough to serve as a complete meal, but it also pairs well with simple side dishes.

Try serving it with:

• Green salad: A fresh salad with cucumber, tomatoes, and a light vinaigrette balances the creamy casserole.
• Roasted broccoli: Adds a delicious vegetable side with lightly crisp edges.
• Garlic green beans: A simple, savory side that complements the Italian seasoning.
• Roasted zucchini: Tender zucchini makes an easy vegetable pairing.
• Caesar salad: Crisp lettuce, Parmesan, and creamy dressing work beautifully alongside the cheesy beef casserole.

Frequently Asked Questions

Can I use fresh cauliflower rice instead of frozen?

Yes! Fresh cauliflower rice can be used in place of frozen cauliflower rice. Cook it before adding it to the baking dish, just as you would with the frozen version.

Can I use Greek yogurt instead of sour cream?

Yes. Plain yogurt can replace the sour cream in this recipe. Greek yogurt is a convenient option if you prefer a slightly tangier flavor and creamy consistency.

How do I keep cauliflower rice casserole from becoming watery?

The most important step is removing excess moisture. Cook the cauliflower rice before using it and drain any excess liquid from the ground beef mixture. Avoid adding too much milk; use only the amount needed to loosen the creamy mixture.

Can I make this casserole ahead of time?

Yes! Prepare the casserole through the cheese-topping step, cover it, and refrigerate until you’re ready to bake. If baking directly from the refrigerator, allow for additional baking time and check that the center is heated through.

Can I substitute the ground beef?

Absolutely. Ground turkey, chicken, or sausage can all be used instead of ground beef. Cook the replacement protein fully before combining it with the spinach and cauliflower rice.

How do I know when the casserole is ready?

The casserole is ready after approximately 22–25 minutes in the oven at 375°F (190°C), when it is hot and bubbly and the cheese has melted. Let it rest for 7–10 minutes before serving.

Storage and Reheating

Refrigerating: Allow leftover casserole to cool, then transfer it to an airtight container. Refrigerate promptly and enjoy within 3–4 days.

Reheating: Reheat individual portions in the microwave until heated through. For larger portions, place the casserole in an oven-safe dish and warm in a 350°F oven until hot throughout. Cover loosely if the cheese begins to brown too much.

Freezing: For best texture, freezing is not specified in the original recipe. Cauliflower rice can release moisture after thawing, so the casserole may become softer. If freezing, store portions in freezer-safe containers and thaw in the refrigerator before reheating.

Final Thoughts

This Ground Beef Casserole with Cauliflower Rice is a comforting, cheesy dinner that’s easy to prepare and full of satisfying flavor. The combination of seasoned ground beef, tender spinach, creamy cauliflower rice, and melted Italian cheese makes it a delicious alternative to traditional rice casseroles.

It’s perfect for busy weeknights, easy family dinners, or meal prep when you want something hearty without spending hours in the kitchen.

Give this easy casserole a try, and don’t forget to share a photo and leave a review. Enjoy!

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