Mexican Quesadilla Casserole

This is so easy and yummy!
Ingredients
  • cooking spray
  • 1 pound ground beef
  • 1/2 cup chopped onion
  • 1 (15 ounce) can tomato sauce
  • 1 (15 ounce) can black beans, rinsed and drained
  • 1 (14.5 ounce) can diced tomatoes with lime juice and cilantro (such as RO*TEL®)
  • 1 (8.75 ounce) can whole kernel sweet corn, drained
  • 1 (4.5 ounce) can chopped green chiles, drained
  • 2 teaspoons chili powder
  • 1 teaspoon ground cumin
  • 1 teaspoon minced garlic
  • 1/2 teaspoon dried oregano
  • 1/2 teaspoon red pepper flakes
  • 6 flour tortillas
  • 2 cups shredded Cheddar cheese

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