Preheat the oven to 400 degrees Fahrenheit. Place the sweet potato pieces in a large bowl, add the olive oil, and stir until the potato pieces are evenly coated in the oil. Add the spices and mix well until they are evenly distributed over the potato pieces.

Place the sweet potato pieces flat on a large baking sheet, drizzling any remaining oil over the top. Spread the pieces out over the top of the baking sheet and put it in the oven. Allow to bake for 15 minutes, then remove the tray, flip the pieces over, and place the tray back in the oven for another 10 minutes. You can then remove the tray from the oven and serve the sweet potato fries immediately, or, if you want the fries to be extra-crispy, you can then turn the oven up to 475 degrees Fahrenheit and leave them in for another 3-5 minutes, watching closely to make sure that they don’t over-crisp and burn.