Preheat oven to 425°F and brush a large sheet pan with 1 tablespoon olive oil.
Place two tortillas on the sheet pan, overlapping or piecing them to cover the bottom of the pan.
In a bowl, mix together the shredded chicken, black beans, bell peppers, corn, red onion, chili powder, and cumin.
Sprinkle half the cheese over the tortillas, then spread the chicken mixture evenly on top.
Sprinkle remaining cheese over the filling, then top with the remaining two tortillas, piecing them to cover completely.
Brush the top tortillas with remaining olive oil and bake for 18-20 minutes until golden brown and cheese is melted.
Let cool for 5 minutes, then cut into squares and serve with sour cream and salsa.