Preheat the oven to 350°F (175°C). In a skillet over medium heat, cook the ground beef until browned. Drain excess fat.

Add the taco seasoning, black beans, corn, and a splash of water. Stir and cook for an additional 5 minutes.

In a baking dish, layer half of the crushed tortilla chips, followed by half of the meat mixture, half of the salsa, and half of the cheese.

Repeat the layers with the remaining ingredients, finishing with cheese on top.

Cover the baking dish with foil and bake for 20 minutes. Remove the foil and bake for an additional 10 minutes until the cheese is bubbly and golden.

Let the casserole cool for a few minutes before serving. Top with lettuce, diced tomatoes, sour cream, and jalapeños if desired.