Chicken Enchilada Casserole

Preheat oven to 350°. In a large skillet over medium heat, heat oil. Add onion and pepper and cook until soft, 5 minutes. Add garlic and cook until fragrant, 1 minute more. Add beans, corn, chicken, and green chilis and cook until warmed through, 5 minutes. Reserve ½ cup enchilada sauce then pour remaining sauce into skillet, stirring to combine.  Spread reserved ½ cup enchilada sauce into a 9”-x-13” then layer 6 tortillas in pan, overlapping to cover the entire pan. Pour ⅓ of mixture over tortillas then top with about ⅓ of each cheese. Top with another layer of tortillas and repeat to make 2 more layers, finishing with cheese.