In a skillet over medium heat, cook the ground beef with chopped onion and minced garlic until browned. Drain excess fat.

Stir in black beans, corn, salsa, and taco seasoning. Cook for an additional 5 minutes.

In a mixing bowl, combine softened cream cheese, sour cream, and 1 cup of shredded cheddar cheese. Mix until smooth.

Preheat the oven to 350°F (175°C).

Spread a thin layer of the meat mixture on the bottom of a 9x13 inch baking dish.

Layer 4 tortillas over the meat mixture, then spread half of the cheese mixture on top.

Repeat the layers with the remaining meat mixture, tortillas, and cheese mixture. Top with remaining cheddar cheese.

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

Let the lasagna cool for a few minutes before slicing. Serve with additional salsa or sour cream if desired.