Heat olive oil in a large frying pan.

Sauté chopped onions until soft.

Add thawed ground beef to the pan and cook until browned, breaking it apart with a spoon.

Strain any excess grease from the pan.

Add canned beans, tomato chunks, and corn to the pan.

Simmer the mixture for about 5 minutes, allowing the flavors to meld.

Preheat oven to 350°F (175°C).

Lightly grease a large round baking dish with oil or non-stick spray.

Place one tortilla on the bottom of the dish.

Spread a portion of the ground beef mixture evenly over the tortilla.

Sprinkle some shredded cheese over the mixture.

Place another tortilla on top of the cheese.

Repeat the layering process with the remaining ground beef mixture, cheese, and tortillas, ending with a tortilla on top.

Sprinkle the remaining shredded cheese evenly over the top tortilla.

Bake uncovered for 30 minutes, or until the cheese is melted and bubbly and the bake is heated through.