Sweet Potato Note: You can use leftover cooked sweet potato or cook it fresh. To roast, preheat your oven to 425ºF. Peel and cut a sweet potato into ½-inch pieces. Place on a baking sheet lined with parchment paper and toss with a small drizzle of oil and a pinch of salt. Spread the pieces out so they are not touching. Roast for 20 to 30 minutes, or until soft, but not overly browned. Alternatively, you can pierce the whole sweet potato a few times, and microwave it on high for 5 to 10 minutes (depending on thickness). Let it cool, then cut into ¼ to ½ inch pieces.