3 cups all-purpose flour
3 tablespoons granulated sugar
2 teaspoons baking powder
2 teaspoons ground cinnamon
1 teaspoon baking soda
1 teaspoon freshly grated nutmeg
1 teaspoon fine salt
3 large eggs
2 1/4 cups low-fat buttermilk
1 1/4 cups unsweetened applesauce
1/4 cup packed dark brown sugar
2 sticks unsalted butter, melted
1 tablespoon vanilla extract
2 medium, sweet apples, such as Rome or Pink Lady
Vegetable oil, for brushing the waffle iron
Maple syrup, for serving