Preheat your oven to 375°F.
Heat the olive oil in a skillet over medium heat and sauté the diced white onion until it is translucent and soft.
In a medium bowl, combine the shredded chicken breast with the sautéed onions, half of the chili powder, and half of the cumin.
In a separate small bowl, whisk together the tomato puree, garlic powder, sea salt, black pepper, and the remaining chili powder and cumin to create the enchilada sauce.
Lightly warm the corn tortillas in a dry pan to make them pliable, then dip each tortilla into the sauce to coat.
Fill each tortilla with the chicken and onion mixture, roll them tightly, and place them seam-side down in a small baking dish.
Pour the remaining red chili sauce over the top of the tortillas and sprinkle evenly with the shredded cheddar cheese.
Bake for 15 minutes until the sauce is bubbling and the cheese has melted completely.