Creating your Keto Taco Casserole involves just a few simple steps. Follow these instructions for a delicious result:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Brown the Beef: In a large skillet over medium heat, brown the ground beef with the diced onion until the meat is fully cooked and the onion is translucent. Drain any excess fat.
3. Add Garlic and Seasoning: Stir in the minced garlic and taco seasoning. Cook for an additional minute until fragrant.
4. Combine Ingredients: Remove the skillet from heat and add the drained diced tomatoes and bell peppers. Mix well to combine.
5. Prepare Egg Mixture: In a mixing bowl, whisk together the eggs, heavy cream, salt, and black pepper until fully combined.
6. Layer Casserole: In a greased 9×13-inch baking dish, spread the meat mixture evenly. Pour the egg mixture over the top, ensuring everything is well-covered.
7. Add Cheese: Sprinkle the shredded cheese generously over the casserole.
8. Bake: Place the baking dish in the preheated oven and bake for 25-30 minutes, or until the casserole is set and the cheese is bubbly and golden.
9. Cool Slightly: Remove from the oven and let the casserole cool for about 5 minutes before slicing.
10. Garnish: Top with diced avocado and chopped cilantro if desired.

These steps will guide you in creating an incredible Keto Taco Casserole that everyone will love!