Preheat oven to 450°F. Optional: Line a baking sheet with parchment paper to prevent sticking.
Scrub sweet potatoes clean and pat dry. Cut in half, then cut each half into wedges (about 8 wedges per potato).
Add potatoes to a bowl and toss with olive oil. Mix together spices in a small bowl, then sprinkle half over the sweet potatoes. Use tongs to toss the potatoes, then add the remaining spices and toss again, until evenly coated.
Arrange the potato wedges in a single layer on the baking sheet, making sure to leave space between each wedge. If needed, use two baking sheets.
Place in the oven and roast for 15 minutes. Flip potatoes, then roast another 8-10 minutes. Serve immediately.