Preheat oven to 425°F (220°C).

Slice sweet potatoes into long, thin sticks, about 1/4-inch wide. Try to keep all of the cuts around the same size to ensure that they cook evenly - if they're too big they will be undercooked, if they are too small they will burn.

In a large bowl, toss the sweet potatoes with the olive oil, garlic powder, paprika, and black pepper. Do not add the salt yet! It will draw out moisture from the potatoes and prevent them from getting crisp.

Line a baking sheet with parchment paper. Place the sweet potato fries onto the baking sheet, being careful that they are not touching each other. Use two baking sheets if needed.

Bake for 15 minutes. Then remove the pan from the oven and take the time to flip each fry with a spatula. Again, make sure they are not touching and place back in the oven. Bake for an additional 10-15 minutes, until the fries are crispy and beginning to brown on the tips.

Sprinkle the salt on the fries as soon as they come out of the oven and serve.