I bunch scallions, chopped (set aside a handful to sprinkle on top)
1 teaspoon chili powder
1 teaspoon ground cumin
1/2 teaspoon dried oregano
1/2 teaspoon salt
12 corn tortillas
2 cups shredded Monterey Jack cheese or Cheddar cheese
Toppings: Salsa, Sour cream or yogurt, scallions
Preheat oven to 400º F. Combine beans, tomatoes, chilies, corn, scallions, chili powder, cumin, oregano and salt in a large bowl.
Lightly oil a 2-3 quart casserole dish. Line the bottom with 6 tortillas, allowing them to overlap in the middle. You can cut off some of the round edges so the tortillas fit against the edge of your casserole dish. Scoop on half the bean mixture. Sprinkle half the cheese on top. Add another layer of tortillas; the rest of the bean mixture. The rest of the cheese.
Bake in the center of the oven for 12-15 minutes, until the cheese is bubbling.
Cut into squares and serve with your favorite salsa and sour cream or yogurt to spoon on top.