In a separate bowl, combine the egg, milk, and vanilla, then add to the dry ingredients. Stir until just combined, being careful not to over-mix.
Gently fold in blueberries.
Lightly spray a large skillet with cooking spray and heat over medium. Pour 2 tablespoons of pancake batter at a time onto hot skillet to make mini-pancakes.
When the bubbles settle and edges begin to set, flip the pancakes and cook through. Repeat until all the batter has been used.