1cupblueberriesfresh or frozen both work; see notes
Soak oats: Combine oats and buttermilk in a medium bowl and set aside for 10 minutes.
Make pancake batter: Add wet ingredients to the bowl with the soaked oats and whisk until well combined. Add all dry ingredients to a large bowl and combine very well, then add the dry to the wet ingredients and fold JUST until combined (use a spatula, NOT a whisk!). Do not overmix! Or you will have dense and gummy pancakes. Fold in blueberries (works great if using fresh; careful with frozen >> see notes).
Cook pancakes: Heat a skillet or griddle over medium heat. Spray with nonstick cooking spray (or melt a little butter in the pan) and drop 3-4 tablespoons of batter per pancake on the hot surface. Cook until bubbles appear, then flip and finish until cooked through. Serve immediately with maple syrup, if you like. Continue until all batter has been used.