Preheat the waffle iron. In a large bowl, whisk together the dry ingredients.
In a smaller bowl, whisk the eggs, melted butter, milk and vanilla. Add the wet ingredients to the dry, and mix until just combined.
Fold in the blueberries. Spray the waffle iron with baking spray.
Cook waffles until light brown and slightly crispy.
Serve dusted with powdered sugar and a little maple syrup. Devour.
Add a little cinnamon to the batter (about a teaspoon) – it will add a really delicious warmth to the waffles.
Grate a little lemon zest into the batter, for a fresher, brighter flavor.