In a skillet over medium heat, cook the ground beef until browned. Drain excess fat.

Add black beans, corn, and taco seasoning to the skillet. Stir and cook for another 5 minutes.

Preheat the oven to 350°F (175°C).

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

Layer 4 tortillas over the salsa, followed by half of the meat mixture, half of the sour cream, and half of the cheese.

Repeat the layers, finishing with tortillas, salsa, and remaining cheese on top.

Cover the dish with foil and bake for 20 minutes.

Remove the foil and bake for an additional 10 minutes, or until the cheese is bubbly and golden.

Let the lasagna cool for 5 minutes before slicing. Serve with additional sour cream and salsa if desired.