Preheat your oven to 375°F (190°C).
In a small mixing bowl, whisk together the tomato puree, chili powder, ground cumin, garlic powder, onion powder, sea salt, and black pepper to create a smooth red chili sauce.
Dice the bell pepper and red onion, then sauté them in a non-stick skillet over medium heat for 4-5 minutes until they are tender and slightly caramelized.
In a medium bowl, combine the shredded cooked chicken breast with the sautéed vegetables and 2 tablespoons of the prepared red chili sauce.
Warm the corn tortillas in the microwave for 15-20 seconds or in a dry pan until they are soft and pliable.
Spread a spoonful of sauce on the bottom of a small baking dish.
Place a portion of the chicken and vegetable mixture into each tortilla, roll them up tightly, and place them seam-side down in the baking dish.
Pour the remaining red chili sauce evenly over the top of the tortillas and sprinkle with the shredded Monterey Jack cheese.
Bake for 15-20 minutes until the cheese is melted and the sauce is bubbling.
Garnish with freshly chopped cilantro before serving hot.