Preheat your oven to 375°F (190°C).
In a small bowl, whisk together the tomato puree, chili powder, cumin, garlic powder, sea salt, and black pepper to create the red chili sauce.
Heat olive oil in a skillet over medium heat and sauté the diced bell pepper and onion until softened.
Add the shredded cooked chicken breast to the skillet and toss with 2 tablespoons of the prepared red chili sauce until well combined.
Warm the corn tortillas slightly in a dry pan or microwave to make them pliable.
Spread a thin layer of sauce on the bottom of a small baking dish.
Place half of the chicken mixture into each tortilla, roll them up tightly, and place them seam-side down in the baking dish.
Pour the remaining red chili sauce over the tortillas and sprinkle with shredded cheddar cheese.
Bake for 15-20 minutes until the sauce is bubbling and the cheese has melted.
Garnish with a dollop of Greek yogurt before serving.