Preheat the oven to 450 degrees. Slice the sweet potatoes into long strands, not too thin, but try to make them similar in size and shape so they will cook evenly and at the same rate. Toss fries with spices and oil, using your hands to combine them well. Lay them out in a single flat layer on a cookie sheet or two.
Bake for about 16 minutes, flipping after 8 minutes. Fries should be slightly crisp and starting to brown.