Preheat your oven to 375°F.
Heat the olive oil in a skillet over medium heat and sauté the diced bell pepper and red onion until they are tender and fragrant.
In a large mixing bowl, combine the cooked shredded chicken, Greek yogurt, sautéed vegetables, and half of the chili powder, cumin, garlic powder, sea salt, and black pepper.
In a separate small bowl, whisk together the tomato puree and the remaining spices to create the zesty enchilada sauce.
Spread two tablespoons of the sauce across the bottom of a small baking dish to prevent sticking.
Divide the chicken and yogurt mixture evenly among the three corn tortillas, roll them up tightly, and place them seam-side down in the baking dish.
Pour the remaining zesty sauce over the top of the tortillas and sprinkle evenly with the shredded cheddar cheese.
Bake for 18 minutes until the cheese is melted and bubbly, then garnish with fresh chopped cilantro before serving.