Preheat oven to 375°F.
Heat oil in a cast iron skillet or large pan set to medium heat. Add onions and peppers. Cook until soft.
In a separate bowl, mix tomato sauce, diced tomatoes, paprika, cumin, and black pepper.
Add chicken, beans and sauce to the pan. Stir to combine and cook for 4-5 minutes.
If using a regular pan, transfer dish to a baking pan. Top mixture with tortilla pieces and then shredded cheese.
Bake in the oven for 15 minutes.
