Combine blueberries and maple syrup in a medium saucepan set over medium-high heat. Bring the mixture to a boil, stirring occasionally, and cook until reduced to a generous 1 cup, about 12 minutes. If making ahead of time, reheat the syrup before serving.
In a large bowl, whisk together flour, baking powder, salt, cinnamon and ginger. In a medium bowl, whisk together egg, milk, maple syrup, vanilla and oil. Pour the wet ingredients over the dry ingredients and stir just until smooth. Stir in blueberries.
Make waffles according to your waffle maker instructions.
Syrup recipe from Gourmet Magazine. Waffles adapted from King Arthur Flour.