Preheat your oven to 375°F (190°C) and lightly grease a small oven-safe baking dish.
In a non-stick skillet over medium heat, sauté the diced onion and red bell pepper until softened and slightly charred.
In a medium bowl, combine the shredded cooked chicken breast, sautéed vegetables, chili powder, cumin, garlic powder, sea salt, and black pepper.
Stir in 2 tablespoons of the red enchilada sauce to the chicken mixture to ensure the filling remains moist during baking.
Briefly warm the corn tortillas in a dry skillet or microwave for 15 seconds to make them pliable and prevent cracking.
Divide the chicken filling evenly between the two tortillas, roll them tightly, and place them seam-side down in the prepared baking dish.
Pour the remaining red enchilada sauce over the top of the tortillas, spreading it to cover the edges.
Bake for 15-20 minutes until the sauce is bubbling and the tortillas are heated through.
Remove from the oven and allow to sit for 2 minutes before drizzling with the Greek yogurt and garnishing with fresh cilantro.