Preheat oven to 375°F.
Heat olive oil in a skillet over medium heat. Add diced bell pepper and red onion, sautéing until softened.
Season the shredded chicken with sea salt, black pepper, and garlic powder.
Stir the seasoned chicken into the skillet with the vegetables to combine.
Spread a small spoonful of enchilada sauce on the bottom of a small baking dish.
Tear the corn tortilla into bite-sized pieces.
Layer half of the tortilla pieces, half of the chicken mixture, and half of the remaining sauce.
Repeat the layers with the remaining tortilla pieces, chicken, and sauce.
Sprinkle the shredded cheddar cheese over the top.
Bake for 15-20 minutes until the sauce is bubbling and the cheese is melted.
Garnish with a dollop of Greek yogurt and fresh cilantro before serving.