Preheat your oven to 375°F (190°C) and lightly grease a small oven-safe baking dish.
Heat the avocado oil in a skillet over medium heat and sauté the diced onion, bell pepper, and zucchini until they are tender-crisp.
In a small mixing bowl, combine the shredded chicken with the sea salt, cumin, and garlic powder, tossing well to coat the meat evenly.
Cut the corn tortilla into bite-sized strips or small squares.
Spread a tablespoon of the enchilada sauce on the bottom of the baking dish, then layer half of the tortilla strips, followed by the chicken and vegetable mixture.
Top with the remaining tortilla strips and pour the rest of the enchilada sauce over the top, ensuring everything is moistened.
Sprinkle the shredded cheddar cheese over the dish and bake for 15 to 20 minutes until the sauce is bubbling and the cheese is melted and slightly golden.
Remove from the oven and garnish with fresh chopped cilantro before serving warm.