Ingredients
For the Casserole:

1 pound ground beef
1 small onion, diced
1 packet taco seasoning (or homemade)
1 can (10 oz) diced tomatoes with green chilies (like Rotel)
1 can (15 oz) black beans, drained and rinsed
1 cup corn (fresh, frozen, or canned)
1 cup salsa
2 cups shredded cheese (cheddar, Mexican blend, or your favorite)
3 cups corn tortillas or 3 cups crushed tortilla chips
½ cup sour cream

Instructions

Preheat your oven to 350°F. Grease a 9×13-inch baking dish.

In a large skillet, cook the ground beef and diced onion over medium heat until browned. Drain excess grease.
Stir in the taco seasoning, diced tomatoes, black beans, corn, salsa and sour cream. Simmer for 5 minutes, stirring occasionally.

Spread half of the corn tortillas or crushed tortilla chips on the bottom of the prepared baking dish.
Layer half of the beef mixture over the chips.
Sprinkle 1 cup of shredded cheese over the beef layer.
Repeat with another layer of tortilla chips, beef mixture, and cheese.

Cover with foil and bake for 20 minutes.
Remove foil and bake for another 10 minutes, until the cheese is melted and bubbly.

Let the casserole cool for 5 minutes, then dollop with sour cream and sprinkle with your favorite toppings (diced tomatoes, sliced jalapeños, chopped cilantro, avocado or guacamole, extra sour cream)

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