Preheat your oven to 375°F (190°C) to get ready for baking.
In a skillet, heat olive oil over medium heat. Add the diced bell pepper and chopped onion, sautéing until softened, about 5 minutes.
In a large bowl, mix the shredded chicken, sautéed vegetables, half of the cheese, ground cumin, garlic powder, salt, and pepper. Stir until evenly combined.
Warm the corn tortillas in a microwave for about 20 seconds to make them pliable.
Spread a thin layer of enchilada sauce on the bottom of a baking dish. Take one tortilla, add a generous spoonful of the chicken mixture, then roll it tightly and place seam side down in the baking dish. Repeat this for the remaining tortillas.
Once all enchiladas are in the baking dish, pour the remaining enchilada sauce over the top. Sprinkle the remaining cheese evenly across the dish.
Cover with foil and bake in the preheated oven for 20 minutes. Remove the foil and bake for an additional 10 minutes, or until the cheese is bubbling and slightly golden.
Remove from the oven and let cool for a few minutes. Serve the enchiladas garnished with fresh cilantro and slices of avocado.
Notes
You can use store-bought or homemade enchilada sauce.