Preheat over to 425 and line a baking sheet with parchment paper
Chop the sweet potatoes into "fry" type matchsticks, about 1/4in thick
Toss in a bowl with the starch and spices
Arrange in a single layer on the baking sheet. You want to make sure you don't crowd your baking sheet otherwise they will steam. Use two if you have a lot of sweet potatoes!
Bake about 30 minutes, flipping at the 20 min mark
Sprinkle over more seasoning if you'd like and serve up with ketchup, ranch, plain, whatever you prefer!