01 -
Preheat oven to 350°F. Lightly grease a 9×13 inch baking dish with cooking spray.
02 -
In a large skillet over medium-high heat, cook ground beef, breaking it into small crumbles. After 3-4 minutes, add diced onion and minced garlic. Continue cooking until beef is no longer pink and onions are translucent, approximately 5 more minutes. Drain excess fat if needed.
03 -
Sprinkle taco seasoning over the beef mixture, stirring to combine. Add black beans, corn, and diced tomatoes with green chilies. Stir thoroughly and let simmer for 2-3 minutes to blend flavors.
04 -
In a bowl, stir together condensed cream of mushroom soup and sour cream until smooth.
05 -
Spread half the beef and vegetable mixture into the greased baking dish. Top evenly with half the sour cream mixture, then sprinkle with 1 cup shredded cheese. Cover with half the crushed Doritos.
06 -
Repeat with remaining beef mixture, then spread over the rest of the sour cream blend. Add the remaining Doritos and final 1 cup of cheese.
07 -
Cover dish with foil and bake for 15 minutes. Remove foil and bake another 10 minutes or until cheese is bubbling and golden around the edges. For extra crispness, broil for 2 minutes, watching closely.
08 -
Let casserole rest for 5-10 minutes before serving. Top with sliced green onions, diced avocado, fresh cilantro, or diced tomatoes as desired.