Preheat the oven to 450°F and line a large rimmed baking sheet with parchment or a silicone baking mat.
Wash the sweet potatoes well, then dry thoroughly with a clean kitchen or paper towel. Cut off the ends, then cut each in half lengthwise. Cut each half into four equal wedges, so each potato yields eight wedges total.
4-6 medium sweet potatoes
Toss the wedges onto the baking sheet and drizzle with olive oil. Sprinkle with the chili powder, cumin, and salt. Use your hands to toss the wedges and distribute the oil and seasonings. Arrange the wedges into a single layer, leaving as much space between them as possible. If they’re crowded on one pan, you’ll have much better results from using two pans than you will from squeezing them all onto one.
2 Tablespoons olive oil, 1 teaspoon chili powder, 1/2 teaspoon ground cumin, 1/2 teaspoon kosher salt
Transfer baking sheet into the oven and roast for 20-25 minutes. They are done when the insides are tender enough to pierce easily with a fork and the outsides are crisp with dark brown spots. Remove, season with more salt to taste, and enjoy.