Preheat your oven to 375°F.
Finely dice the bell pepper and red onion.
Heat the avocado oil in a skillet over medium heat and sauté the peppers and onions until they are tender and slightly caramelized.
In a large mixing bowl, combine the cooked shredded chicken breast, Greek yogurt, red enchilada sauce, sea salt, black pepper, and chili powder until well incorporated.
Slice the corn tortilla into thin, bite-sized strips.
In a small oven-safe baking dish, create a base layer using half of the tortilla strips.
Spread the creamy chicken and vegetable mixture evenly over the tortilla strips.
Top the mixture with the remaining tortilla strips and sprinkle the shredded cheddar cheese across the top.
Bake for 15 to 20 minutes until the cheese is melted and the sauce is bubbling around the edges.