Preheat your oven to 375°F and lightly grease a small baking dish.
Heat olive oil in a skillet over medium heat and sauté the diced onion and minced garlic until translucent and fragrant.
Add the shredded chicken breast, cumin, sea salt, and black pepper to the skillet, tossing for 2 minutes to combine flavors.
In a small bowl, whisk together the tomato puree and chili powder to create a clean, simple red enchilada sauce.
Briefly warm the corn tortillas in a dry pan to make them pliable, then dip each one into the sauce to coat both sides.
Place a portion of the chicken mixture in the center of each tortilla, roll tightly, and place seam-side down in the baking dish.
Pour the remaining red sauce over the top and sprinkle evenly with the shredded cheddar cheese.
Bake for 15-20 minutes until the sauce is bubbling and the cheese has melted into a golden crust.