Preheat your oven to 375°F and lightly grease a small oven-safe baking dish.
Slice the chicken breast into small bite-sized pieces and season with sea salt, black pepper, and garlic powder.
Heat the avocado oil in a skillet over medium-high heat. Add the diced bell peppers and red onion, sautéing for 3-4 minutes until they begin to soften.
Add the chicken to the skillet and cook until browned and cooked through, approximately 5-6 minutes.
In a small mixing bowl, whisk together the red enchilada sauce and the Greek yogurt until a smooth, creamy sauce forms.
Slice the corn tortilla into thin strips. Place half of the strips at the bottom of the baking dish.
Layer the cooked chicken and vegetable mixture over the tortillas, then pour the creamy enchilada sauce evenly over the top.
Top with the remaining tortilla strips and sprinkle with the shredded cheddar cheese.
Bake for 15-20 minutes until the sauce is bubbling and the cheese has melted into a golden crust.
Remove from the oven and let it rest for 5 minutes before garnishing with freshly chopped cilantro.