Preheat the oven to 375 degrees Fahrenheit and spray a 9X13 baking pan with non-stick cooking spray. Set aside.
Heat 1 tablespoon olive oil in a large skillet over medium heat. Add 1 diced small onion and 1 diced red bell pepper. Cook for 3-4 minutes, until softened.
Stir in 1 can cream of mushroom soup, 1 can cream of chicken soup, 1 can diced tomatoes with green chilies, ½ cup chicken broth, 1 tablespoon chili powder, and 1 teaspoon garlic powder.
Stir in 3 cups cooked and shredded chicken until combined.
Cut 12 corn tortillas into pieces.
Spread half of the chicken mixture on top of the tortillas and sprinkle 1 cup shredded cheddar cheese over the chicken mixture.
Then repeat the layers 1 more time in the pan: tortillas, chicken mixture and shredded cheese.
Bake for 25-30 minutes until the mixture is heated through and the casserole is bubbly.
Remove from the oven. Let the casserole sit for 5 minutes and then it’s ready to serve and enjoy!