Preheat your oven to 375°F (190°C).
Heat the olive oil in a small skillet over medium heat and sauté the diced red onion and bell pepper until softened, about 5 minutes.
In a medium bowl, combine the cooked shredded chicken with the sautéed vegetables and half of the chili powder, cumin, garlic powder, salt, and pepper.
In a separate small bowl, whisk together the tomato puree, chicken broth, and the remaining spices to create the red chili sauce.
Spread a small spoonful of the sauce on the bottom of a small baking dish.
Lightly warm the corn tortillas to make them pliable, then dip each one into the sauce to coat both sides.
Place a portion of the chicken and vegetable mixture in the center of each tortilla, roll tightly, and place seam-side down in the baking dish.
Pour the remaining sauce over the top of the tortillas and sprinkle with the shredded cheddar cheese.
Bake for 15 to 20 minutes until the sauce is bubbly and the cheese is melted.
Garnish with fresh chopped cilantro before serving hot.