Preheat your oven to 375°F (190°C).
In a skillet over medium heat, add the avocado oil, diced bell peppers, and red onion, sautéing until the vegetables are tender and slightly caramelized.
In a mixing bowl, combine the cooked shredded chicken breast, Greek yogurt, half of the enchilada sauce, sea salt, black pepper, and garlic powder until well incorporated.
Cut the corn tortilla into bite-sized strips or small squares.
Spread a spoonful of the remaining enchilada sauce on the bottom of a small oven-safe baking dish.
Layer half of the tortilla pieces on the bottom, followed by the creamy chicken mixture and the sautéed vegetables.
Top with the remaining tortilla pieces and drizzle the rest of the enchilada sauce over the top.
Sprinkle the shredded sharp cheddar cheese evenly across the surface.
Bake for 15-20 minutes until the sauce is bubbling and the cheese is melted and golden.
Garnish with fresh chopped cilantro before serving.