Preheat your oven to 375°F and lightly grease a small oven-safe baking dish.
Poach or pan-sear the chicken breast until the internal temperature reaches 165°F, then shred finely using two forks.
In a small skillet over medium heat, add the olive oil and sauté the diced onion and red bell pepper until softened and fragrant.
In a separate small bowl, whisk together the tomato puree, chicken broth, chili powder, ground cumin, garlic powder, sea salt, and black pepper to create the red chili sauce.
Combine the shredded chicken with the sautéed vegetables and 2 tablespoons of the prepared red chili sauce, mixing well to coat.
Warm the corn tortillas in a dry pan for 30 seconds per side until pliable, then fill each with the chicken and vegetable mixture and roll tightly.
Place the tortillas seam-side down in the baking dish, pour the remaining red chili sauce over the top, and sprinkle with the shredded cheddar cheese.
Bake for 15 to 20 minutes until the sauce is bubbling and the cheese is melted and slightly golden.