Preheat oven to 400°F (200°C). Scrub two large sweet potatoes clean and then thickly cut them into fries. In a bowl, rub the sweet potato fries with 2 tablespoons of avocado oil or coconut oil. Season the fries with approximately half a teaspoon each of chili powder, paprika, garlic powder, and onion powder, then add sea salt and pepper to taste. Spread the seasoned fries on a baking sheet and roast for about 30-40 minutes, or until they are tender on the inside and crispy on the edges.