Traditional quesadillas get a flavorful twist with cumin, garlic and oregano. Layer it in a casserole for convenient preparation.
Preheat oven to 350°F. Brown beef and onion in large skillet on medium-high heat; drain. Add tomato sauce, beans, corn and green chiles; mix well. Stir in all of the seasonings. Bring to boil. Reduce heat to low; simmer 5 minutes.
Spread 1/2 cup of the beef mixture on bottom of 13x9x2-inch baking dish sprayed with no stick cooking spray. 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 mixture and cheese.
Bake 15 minutes or until heated through. Let stand 5 minutes before serving.