This recipe requires about 1 1/4 cups of leftover mashed sweet potatoes, making it a fantastic way to reduce food waste. If you don’t have leftovers, you can quickly roast or boil sweet potatoes in advance and mash them. For a tangier batter, substitute the sour cream and milk with 1 1/4 cups of buttermilk. To maintain a fluffy texture, be careful not to overmix the batter—small lumps are perfectly fine. You can easily double or triple this recipe for larger groups. Feel free to adjust the maple syrup amount to suit your desired sweetness level.