Preheat the oven to 430 degrees F. Line a baking sheet with foil or parchment paper.
Peel and grate the sweet potatoes using a box grater. Using your hands, squeeze as much liquid as possible out of the grated sweet potato. This will result in crispier fritters.
Discard the liquid and add the grated sweet potato to a large mixing bowl. Add the egg, oat flour, cornstarch, paprika, onion powder, garlic powder, salt and pepper and mix well to combine. Allow mixture to sit for 5 minutes.
Spray a bit of cooking spray over the lined baking sheet.
Take a small handful of the sweet potato mixture and form it into 10 tightly packed patties, about 2 inches in diameter and 1/2 inch in thickness. Place each of the fritters on the baking sheet.
Lightly brush the top and sides of each patty with olive oil.
Bake for 25 to 30 minutes or until golden brown and crisp around the edges.
If desired, sprinkle with fresh parsley and serve warm by themselves or with your favourite dip.