Scrub the sweet potatoes clean. Slice sweet potatoes into 1/4 rounds.
Use mini cookie cutters to cut jack-o-lantern faces, stars, and pumpkins into the center of each sweet potato slice. Or, use a small knife and carve a mini jack-o-lantern face into the sweet potato slices.
Place sweet potatoes on a parchment-lined baking sheet. Drizzle with olive oil, sprinkle with pumpkin pie spice, sugar, and salt. Bake in an oven preheated to 400°F and cook until tender, about 18-22 minutes.