Preheat oven to 375°F.
Poach chicken breast in water or broth until cooked through, then shred with two forks.
In a small skillet, heat avocado oil over medium heat and sauté diced onion until translucent.
Add tomato puree, chicken bone broth, chili powder, cumin, garlic powder, onion powder, sea salt, and black pepper to the skillet and simmer for 5 minutes.
Toss the shredded chicken with 2 tablespoons of the prepared red sauce.
Warm corn tortillas in a dry pan or microwave until pliable.
Fill each tortilla with the chicken mixture, roll tightly, and place seam-side down in a small baking dish.
Pour the remaining sauce over the tortillas and sprinkle with Monterey Jack cheese.
Bake for 10-15 minutes until the cheese is melted and bubbly.
Garnish with fresh cilantro before serving.