In a large bowl, combine flour, brown sugar, baking powder, baking soda, salt, cinnamon, ginger and nutmeg.
2 cups all-purpose flour, ¼ cup packed dark brown sugar, 2 teaspoons baking powder, 1 teaspoon baking soda, 1 teaspoon salt, 1 teaspoon ground cinnamon, ½ teaspoon ground ginger, ¼ teaspoon ground nutmeg
In another bowl, whisk together milk, sweet potatoes, oil, eggs and vanilla until smooth.
1 ½ cups milk, 1 cup mashed sweet potatoes, ¼ cup vegetable oil, 2 large eggs, 1 teaspoon pure vanilla extract
Pour wet mixture into dry and stir until completely incorporated and no dry bits remain.
Preheat your waffle maker. Once hot, spray plates with oil if needed, then scoop batter onto plates, close, and cook according to manufacturer’s instructions. Keep waffles warm on a sheet pan set in a low oven while you repeat with remaining batter.
Spray oil
Notes
You will need 1 large or 2 medium sweet potatoes to yield 1 cup mashed. Peel and dice sweet potatoes and add to a pot, then cover with water. Boil for 15 minutes, or until tender. Drain and mash or puree.