Mix salt, garlic powder, cayenne pepper, cinnamon, and cornstarch in a small bowl.
Place sweet potato slices in a shallow dish and sprinkle seasonings over top. Toss well, covering potatoes in seasoning. Add oil and toss well.
Preheat fryer at 400, once it's hot, cook whole batch for 10 minutes, checking every minute after that (mine took 12 minutes*).
Freezing Instructions: Homemade sweet potato fries can be frozen for up to two months. To reheat, place in air fryer for 5-10 minutes, or until crispy and warm.Garlic Parmesan Fries - Toss the fries in cornstarch, 1 minced clove of garlic, salt and pepper. After air frying, sprinkle with freshly grated parmesan cheese and chopped fresh parsley.Sweet Potato Wedges: Cut into thicker "wedges". Add 5-10 minutes to cook time, until cooked and crispy.Baked Sweet Potato Fries: Follow my instructions HERE!