Preheat the oven to 425°F. Spray two baking sheets with canola oil cooking spray. Cut 4 scrubbed, unpeeled sweet potatoes in half, then slice each half into several long wedges. Place the wedges on the baking sheets, mist them with additional cooking spray, and sprinkle them with 1 teaspoon of ground cinnamon, ½ teaspoon of ground nutmeg, ½ teaspoon of ground black pepper, and ¼ teaspoon of kosher salt. Bake the fries for 20 minutes, then turn them and cook for an additional 10 to 20 minutes, or until they’re brown and crispy on the outside, and soft in the middle.