Preheat your oven to 375°F and lightly grease a small baking dish with a touch of olive oil.
In a small skillet over medium heat, add the olive oil and sauté the diced onion and minced garlic until they are soft and translucent, about 5 minutes.
Stir in the tomato puree, chili powder, ground cumin, sea salt, and black pepper, allowing the sauce to simmer gently for 5-7 minutes until the flavors meld.
In a medium mixing bowl, combine the cooked shredded chicken breast with 2 tablespoons of the warm red chili sauce to keep the protein moist.
Briefly warm the corn tortillas in a dry pan or microwave for 10 seconds to make them pliable, then divide the chicken mixture evenly between the two tortillas.
Roll each tortilla tightly and place them seam-side down in the prepared baking dish.
Pour the remaining red chili sauce over the top of the tortillas and sprinkle evenly with the shredded Monterey Jack cheese.
Bake for 15-20 minutes until the sauce is bubbling and the cheese has melted into a golden, gooey layer.
Remove from the oven and garnish with fresh chopped cilantro before serving warm.