Preheat your oven to 375°F (190°C).
In a small saucepan over medium heat, combine the tomato puree, chili powder, cumin, garlic powder, and sea salt. Simmer for 3-5 minutes until the flavors meld, then set aside.
Heat the olive oil in a skillet over medium heat. Sauté the diced onion and bell pepper for 4 minutes until softened and slightly caramelized.
In a mixing bowl, toss the shredded chicken with the sautéed vegetables and 2 tablespoons of the prepared red chili sauce.
Warm the corn tortillas in a dry skillet or microwave for 15 seconds until pliable so they do not crack.
Place a portion of the chicken mixture into each tortilla, roll tightly, and place seam-side down in a small oven-safe baking dish.
Pour the remaining red chili sauce over the top of the tortillas and sprinkle evenly with the shredded cheddar cheese.
Bake for 12-15 minutes until the sauce is bubbling and the cheese has melted beautifully.
Garnish with fresh chopped cilantro before serving warm.