Preheat your oven to 375°F.
Heat the avocado oil in a skillet over medium heat and sauté the diced yellow onion and red bell pepper until they are softened and fragrant.
Poach the chicken breast in a pot of simmering water for approximately 12 minutes until cooked through, then remove and shred with two forks.
In a small mixing bowl, whisk together the tomato puree, chili powder, ground cumin, garlic powder, sea salt, and black pepper to create the red chili sauce.
Toss the shredded chicken with 2 tablespoons of the prepared red chili sauce and the sautéed vegetables.
Briefly warm the corn tortillas in a dry pan over medium heat until they are soft and pliable.
Divide the chicken and vegetable mixture evenly between the two tortillas, roll them up 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 completely melted.
Remove from the oven and serve immediately with a dollop of plain Greek yogurt and a sprinkle of fresh cilantro.