In order to prepare Sweet Potato French Fries, you will need the following: fresh sweet potatoes, olive oil, black pepper, time, garlic salt, a cookie sheet, and a Ziploc bag. Cut the potatoes into potato strips. The thicker they are, the longer it will take for them to cook. You will need to keep that in mind, when deciding whether you make thin strips or larger steak fries. Pile the cut up potatoes onto a cookie sheet. Place your seasoning in a Ziploc bag. Place the potatoes in the bag and shake them up. Bake them at 350 degrees for approximately 45 minutes. Serve.