Leave the skin on and cut sweet potatoes into thin, even match sticks with a very sharp knife.
Transfer to a large bowl and drizzle with olive oil. Then sprinkle with seasonings, sugar and toss.
Transfer fries to 1 large or 2 baking sheets (or more if making a larger batch) and arrange in a single layer to ensure they crisp up.
Bake for 15 minutes and flip/stir to cook on the other side. Bake for 10 to 15 minutes more or until brown and crispy. You'll know they're done when the edges are dark brown and crispy.
Remove from oven and either serve as is or drizzle with a bit of maple syrup (or honey if not vegan) to offset spiciness.
*2 tsp fresh thyme can be subbed per 1 tsp dried thyme. *If you aren't into super spicy foods, just scale back on the cayenne a bit for slightly less heat without sacrificing flavor. *Cajun spice mix adapted from bon appetit. *Nutrition information is a rough estimate calculated without optional sugar.