01 -
In a large skillet, cook ground beef and chopped onion over medium-high heat until beef is fully browned and onion is translucent, breaking meat into small crumbles as it cooks.
02 -
Stir in minced garlic and cook for 30 seconds to release aroma without burning, then carefully drain excess fat to prevent greasiness.
03 -
Add taco seasoning packet, undrained Rotel tomatoes, and drained Mexicorn to the skillet. Stir thoroughly and cook until mixture is heated through and evenly coated.
04 -
Spread half of the meat mixture in a 7 x 11 inch casserole dish. Top evenly with half of the shredded cheese, then a layer of crushed Doritos. Repeat layering with remaining meat, cheese, and Doritos, pressing gently to settle layers.
05 -
Bake uncovered in a preheated oven at 350°F (175°C) for 15 to 20 minutes, or until cheese is melted and Dorito edges turn crisp and golden.
06 -
Remove casserole from the oven and allow to rest for 5 minutes to let layers set. Serve topped with generous spoonfuls of sour cream and fresh Pico de Gallo to balance richness with freshness.