In a small bowl, combine sugar and cinnamon; set aside.
Make batter, following steps 1 through 3 in the buttermilk waffles recipe.
Ladle 1/3 cup batter onto each square of the waffle grid; spread almost to the edges. Sprinkle with 1 to 2 teaspoons cinnamon sugar.
Close lid; bake 3 to 5 minutes, until no steam emerges from waffle iron. Transfer to a baking sheet; place in an oven set to low heat, about 200 degrees, while using remaining batter. Serve warm.