Preheat your oven to 375 degrees Fahrenheit.
Poach the chicken breast in simmering water for 12-15 minutes until cooked through, then shred it using two forks and season with half of the sea salt and black pepper.
Heat the avocado oil in a skillet over medium heat and sauté the diced red onion and red bell pepper until softened, about 5 minutes.
In a small bowl, whisk together the tomato sauce, chili powder, ground cumin, garlic powder, and the remaining salt and pepper to create the red chili sauce.
Warm the corn tortillas slightly in a dry pan so they are pliable, then dip each one into the sauce to lightly coat both sides.
Place a portion of the shredded chicken and sautéed vegetables in the center of each tortilla, roll them up tightly, and place them seam-side down in a small baking dish.
Pour the remaining chili sauce over the top of the tortillas and sprinkle evenly with the shredded Monterey Jack cheese.
Bake for 15-20 minutes until the cheese is melted and bubbling.
Garnish with fresh chopped cilantro before serving.