Preheat the oven to 425°F. In a small bowl, toss together the chili powder, paprika, garlic powder, salt, brown sugar, and cumin. In a large bowl, toss the potatoes with the oil, then with the spice mix until evenly coated. Transfer the potatoes to a large baking sheet and roast, flipping occasionally, until tender, browned, and crisped in places, about 25 minutes. Serve immediately.
Photo: Scott Phillips