Preheat your oven to 375°F and lightly grease a small individual-sized baking dish.
Dice the zucchini, red bell pepper, and yellow onion into small, uniform pieces.
Heat the avocado oil in a skillet over medium heat and sauté the diced vegetables until they are tender and slightly caramelized.
Season the vegetable mixture with sea salt, black pepper, and garlic powder, then remove from heat.
Shred the cooked chicken breast and toss it in a bowl with half of the red enchilada sauce.
Slice the corn tortilla into thin strips or small bite-sized squares.
In the prepared baking dish, layer the shredded chicken, sautéed vegetables, and tortilla strips, tossing gently to combine.
Pour the remaining enchilada sauce over the top and sprinkle evenly with the shredded cheddar cheese.
Bake for 15 to 20 minutes until the sauce is bubbling and the cheese has melted into a golden crust.