In a large skillet over medium heat, warm the avocado or olive oil. Add the chopped onion and cook until it's translucent, about 3–4 minutes. Stir in the garlic and red bell pepper.
Once the vegetables are softened, add in the shredded chicken and diced green chiles. Season with sea salt and black pepper to taste. Stir everything together until well combined.
Preheat your oven to 375°F (190°C). Pour half of the red enchilada sauce into a baking dish.
Take one cassava flour tortilla at a time and spoon some of the chicken mixture into the center. Top with a sprinkle of non-dairy cheddar cheese shreds before rolling it up tightly. Place each rolled tortilla seam-side down in the prepared baking dish.
Pour the remaining enchilada sauce over the assembled tortillas and sprinkle any leftover non-dairy cheddar cheese on top. Cover with foil and bake for about 20 minutes.
After baking, remove from oven and let cool slightly before serving. Garnish with fresh cilantro, diced red onions, sliced avocado, or non-dairy sour cream if desired.