Preheat your oven to 350°F (175°C). Grease a 9x13 inch baking dish with cooking spray or olive oil.

In a large skillet over medium heat, add the lean ground beef, diced onion, and minced garlic. Cook until the beef is browned for about 7–10 minutes. Drain excess fat.

Stir in the taco seasoning, black beans, corn, and diced tomatoes. Let this simmer for 2-3 minutes, stirring gently.

In a mixing bowl, combine the cream of mushroom soup and sour cream until smooth.

In the prepared baking dish, layer half of the beef mixture, half of the creamy layer, a cup of shredded cheese, and half of the crushed Doritos.

Repeat the layering process with the remaining ingredients.

Cover with aluminum foil and bake for 15 minutes, then remove foil and bake for an additional 10 minutes until bubbly and golden brown.

Let it rest for 5-10 minutes, then garnish with fresh toppings before serving.