Quesadilla Casserole

I thought this one would be yet another mexican casserole, but it was REALLY good and I will definitely make it again.  It could also be frozen and eaten later.

1 lb ground beef
1/2 cup chopped onion
2 tsp chili powder
1 tsp ground cumin
1 tsp dried minced garlic
1/2 tsp oregano
1/2 tsp crushed red pepper (optional)
16 oz tomato sauce
1 can (15 oz) black beans, drained and rinsed
1 can (8 3/4 oz) whole kernel corn, undrained
1 can (4 1/2 oz) green chilies, undrained
6 flour tortillas (8 inch size)
2 cups shredded Cheddar Cheese

1. Brown beef and onion in a large skillet on medium-high. Add tomato sauce, beans, corn and green chilies. Mix well. Stir in all of the spices except the red pepper. Bring to a boil, reduce heat low and simmer 5 minutes. Add red pepper to taste if desired.
2. Spread 1/2 cup of the beef mixture on bottom of 9X13 pan (sprayed with pam). I like to use the foil pans for freezer meals. Top with 3 of the tortillas, overlapping as needed. Layer with 1/2 of the remaining beef mixture and 1/2 of the cheese. Repeat with remaining tortillas, beef and cheese.
3.  Bake uncovered at 350 degrees for 15-20 minutes or until heated through. Let stand 5 minutes before serving.