In a large skillet over medium heat, sauté the chopped onion and green bell pepper until softened, about 5 minutes.
In a large mixing bowl, combine the shredded chicken, diced tomatoes with green chilies, cream of chicken soup, and sour cream. Stir until well combined.
Add the sautéed onion and bell pepper to the mixture, and then fold in the corn tortilla strips.
Season the mixture with cumin, chili powder, salt, and pepper, adjusting to taste.
Pour half of the chicken mixture into a greased 9x13-inch baking dish. Sprinkle half of the shredded cheddar cheese over the top.
Layer the remaining chicken mixture on top and finish with the remaining cheddar cheese.
Cover the dish with aluminum foil and bake for 25 minutes. Then, uncover and bake for an additional 10-15 minutes until the cheese is bubbly and golden.
Remove from oven and let it cool slightly before serving.
Notes
Garnish with fresh cilantro and serve with a side of avocado or a simple salad for added freshness.