Low Carb Taco Casserole Recipe

Why You’ll Love This Recipe

I appreciate how fast this casserole comes together — it takes just 25 minutes from start to finish. I get all the flavors of taco night without the extra carbs from tortillas or shells. The cauliflower rice blends beautifully with the seasoned beef, and the melted Colby/Jack cheese creates a rich, gooey topping that I can’t resist.

I also love how customizable it is. I can load it up with fresh toppings like avocado, jalapeños, or salsa depending on what I’m craving. It’s perfect for family dinners, meal prep, or even casual gatherings.

Ingredients

(Here’s a tip: Check out the full list of ingredients and measurements in the recipe card below.)

10 ounces frozen cauliflower rice
2–3 tablespoons oil
2 lbs ground beef
1 small red bell pepper, seeded and chopped
1 small white onion, chopped
4 tablespoons taco seasoning
1 tablespoon tomato paste
1/2 cup water
3 cups shredded Colby/Jack cheese
1 cup sour cream

Toppings:
chopped lettuce
chopped tomato
sliced black olives
avocado or guacamole
cilantro
sliced jalapeño
salsa or hot sauce

Directions

1. I preheat the oven to 350ºF.

2. I pan fry the cauliflower rice in oil over medium-high heat until it starts to brown. Once cooked, I transfer it to a greased 2-quart casserole dish and spread it into an even layer.

3. In the same pan, I brown the ground beef with the chopped red pepper and onion over medium-high heat. If there’s excess fat, I drain it. Then I add taco seasoning, tomato paste, and water. I stir everything together and cook until the liquid absorbs and the mixture thickens. I spread this evenly over the cauliflower rice layer in the casserole dish.

4. I top everything with shredded cheese and bake for 10–15 minutes, until the cheese is melted and bubbly.

5. After removing it from the oven, I spread sour cream over the top and finish it with extra shredded cheese and my favorite toppings.

Servings and Timing

This recipe makes 8 servings.

Prep time: about 10 minutes
Cook time: about 15 minutes
Total time: 25 minutes

Variations

I sometimes swap the ground beef for ground turkey or ground chicken when I want a lighter option. For extra heat, I mix diced green chilies or additional jalapeños into the beef mixture. If I want even more veggies, I stir in chopped zucchini or spinach while browning the meat.

For a creamier texture, I occasionally blend softened cream cheese into the beef mixture before layering it in the casserole dish.

storage/reheating

I store leftovers in an airtight container in the refrigerator for up to 4 days. When I’m ready to reheat, I warm individual portions in the microwave for 1–2 minutes until heated through.

If I’m reheating a larger portion, I cover the casserole dish with foil and warm it in a 325ºF oven for about 15–20 minutes. I like to add fresh toppings after reheating for the best texture and flavor.

I can also freeze this casserole (without fresh toppings) for up to 2 months. I thaw it overnight in the refrigerator before reheating.

FAQs

Can I use fresh cauliflower instead of frozen cauliflower rice?

Yes, I can pulse fresh cauliflower florets in a food processor until rice-sized. I make sure to sauté it well to remove excess moisture before layering it in the casserole.

Can I make this casserole ahead of time?

I often assemble the casserole ahead of time and refrigerate it (without baking) for up to 24 hours. When I’m ready, I bake it as directed, adding a few extra minutes if needed.

Is this recipe keto-friendly?

Yes, I consider this recipe keto-friendly since it replaces traditional taco shells or rice with cauliflower rice and keeps the carb count low.

What other cheeses work well in this recipe?

I sometimes use cheddar, Monterey Jack, or a Mexican blend if I don’t have Colby/Jack on hand. Any good melting cheese works nicely.

How do I keep the casserole from becoming watery?

I make sure to brown the cauliflower rice thoroughly and drain excess fat from the beef. Cooking off the liquid after adding seasoning also helps keep the layers firm and not watery.

Conclusion

This low carb taco casserole is one of my favorite quick and satisfying meals. I love how simple it is to prepare while still delivering bold taco flavor in every bite. Whether I’m cooking for my family or prepping meals for the week, this dish always earns a spot on my table.