Preheat your oven to 375°F (190°C).
In a large skillet, cook the ground beef over medium heat until browned. Drain any excess fat.
Add the taco seasoning to the beef and stir to combine.
In a large mixing bowl, combine the cooked beef, black beans, corn, salsa, and half of the shredded cheese.
Spread a layer of crushed tortilla chips in the bottom of a baking dish.
Pour the beef mixture over the chips and spread evenly.
Top with the remaining crushed tortilla chips and shredded cheese.
Bake in the preheated oven for 25-30 minutes, or until the cheese is melted and bubbly.
Remove from the oven and let it cool for a few minutes before serving. Top with sour cream if desired.