Pre-heat waffle iron to medium-high heat (I set mine to about 5 out of 6).
In a small bowl, whisk wet ingredients (except blueberries) together until smooth.
In a larger bowl, mix all dry ingredients, then add mixed wet ingredients and stir until just combined. Fold in blueberries.
Spray waffle iron with non-stick cooking spray. Pour 1/5 of waffle batter into waffle iron (~1/2 cup), flip waffle maker to other side and repeat. Cook for about 4 minutes or until waffle is cooked through (depending on your waffle maker, it will beep when it's ready). Repeat with final waffle.
Serve waffles with maple syrup, butter, and fruit, if desired.