Preheat your oven to 375°F (190°C).
Heat the olive oil in a small skillet over medium heat and sauté the diced bell pepper and onion until softened, about 5 minutes.
In a medium mixing bowl, combine the shredded chicken, Greek yogurt, diced green chilies, and the sautéed vegetables.
Season the chicken mixture with sea salt, black pepper, and chili powder, stirring until well combined.
Spread a small amount of the red enchilada sauce on the bottom of a small oven-safe baking dish.
Place one corn tortilla on the bottom, then spread half of the chicken mixture over it, followed by a drizzle of sauce.
Layer the second tortilla on top, add the remaining chicken mixture, and pour the rest of the enchilada sauce over the top.
Sprinkle the shredded cheddar cheese evenly over the top of the bake.
Bake for 15 to 20 minutes until the sauce is bubbling and the cheese is melted and golden.
Garnish with freshly chopped cilantro before serving.