01 -
In a large skillet over medium-high heat, cook ground beef and chopped onion until beef is no longer pink and onion is translucent, stirring frequently to break the meat into small crumbles.
02 -
Stir in minced garlic and cook for 30 seconds until fragrant, then carefully drain excess fat from the skillet to reduce greasiness.
03 -
Add taco seasoning, undrained Rotel tomatoes, and drained Mexicorn. Stir thoroughly to combine and heat until the mixture is evenly coated and warmed through.
04 -
In a 7x11 inch baking dish, spread half of the meat mixture evenly, then top with half of the shredded cheese, followed by half of the crushed Doritos. Repeat with remaining meat, cheese, and Doritos, pressing gently to compact layers.
05 -
Bake uncovered in a preheated 350°F oven for 15 to 20 minutes, until cheese is melted and bubbly and Dorito edges are crisped and golden.
06 -
Allow casserole to rest for 5 minutes after baking, then serve topped with sour cream and fresh Pico de Gallo to add freshness and balance the richness.