Preheat and grease your waffle iron. Preheat oven to 200.
Grind the oats in your food processor or blender until they are the consistency of whole-wheat flour.
In a medium bowl, whisk together the oat flour, other flour, sugar, baking powder, salt, and baking soda.
In another bowl, melt the butter and then whisk in the eggs. When well combined, whisk in the yogurt.
Add the wet ingredients to the dry and stir until just combined. Gently mix in the blueberries.
Ladle the recommended amount of waffle batter into the hot waffle iron, close the lid, and cook until the waffle is golden. Put cooked waffle in the oven to keep warm and repeat the process until all waffles are baked. Serve with extra blueberries and maple syrup.