Cook the Taco Meat
Heat olive oil in a skillet.
Add ground beef and cook until browned, breaking apart with a spoon.
Add onion, garlic, and bell pepper.
Cook until softened.
Stir in taco seasoning, salt, and pepper.
Simmer for 2 minutes to blend the flavors.
Prepare the Casserole Layer
In a bowl, whisk together sour cream, cream cheese, and eggs.
Add half of the cheddar and half of the mozzarella.
Mix until creamy.
Assemble the Casserole
Preheat oven to 350°F (175°C).
Grease a baking dish.
Spread the cooked taco meat evenly across the bottom.
Pour the creamy cheese mixture over the top.
Sprinkle the remaining cheese.
Bake
Bake for 25–30 minutes, until bubbly and golden.
Serve
Let cool for 5 minutes.
Add your favorite toppings and enjoy a flavorful low carb taco casserole.