Preheat the oven: Preheat your oven to 375°F (190°C). Grease a 9×9-inch baking dish with cooking spray or a little olive oil.

Cook the ground beef: In a large skillet, brown the ground beef over medium heat, breaking it apart with a spoon. Once browned, drain any excess grease. Add the diced onion and cook for 2-3 minutes until softened.

Season the beef: Stir in the taco seasoning mix and salsa. Simmer for about 5 minutes until the mixture thickens. If you’re using refried beans, corn, or diced green chilies, add them now and stir to combine. Remove from heat.

Assemble the burrito pie: Spread a thin layer of the beef mixture on the bottom of the prepared baking dish. Then, place a layer of flour tortilla quarters over the beef. Spread a portion of the beef mixture over the tortillas, followed by a layer of shredded cheddar and Monterey Jack cheese.

Repeat the layers: Repeat the layering process with the remaining tortillas, beef mixture, and cheese until you’ve used all ingredients, finishing with a layer of cheese on top.

Bake: Cover the baking dish with aluminum foil and bake for 20-25 minutes. Then, remove the foil and bake for an additional 10-15 minutes, or until the cheese is melted and bubbly, and the casserole is heated through.

Garnish and serve: Once baked, remove from the oven and let it rest for 5 minutes before serving. Garnish with freshly chopped cilantro, if desired.

Enjoy: Serve your Cheesy Burrito Pie with a side of sour cream, salsa, or guacamole for extra flavor!