Preheat your oven to 375°F and lightly grease a small baking dish with a touch of oil.
Poach the chicken breast in simmering water for 12 minutes until cooked through, then shred it finely with two forks.
Heat olive oil in a skillet over medium heat and sauté the diced peppers and onions until they are soft and translucent.
In a small bowl, whisk together the tomato puree, chili powder, cumin, garlic powder, salt, and pepper to create a smooth sauce.
Combine the shredded chicken and sautéed vegetables in a bowl with two tablespoons of the prepared red chili sauce.
Briefly warm the corn tortillas in a dry pan to make them pliable, then fill each with the chicken mixture and roll tightly.
Arrange the tortillas seam-side down in the baking dish, pour the remaining sauce over the top, and sprinkle with shredded cheddar cheese.
Bake for 15 minutes until the sauce is bubbling and the cheese has melted into a golden, delicious layer.