Heat griddle to 375 degrees. Whisk together flour, baking powder, baking soda, salt, sugar and cinnamon in medium bowl. Add beaten eggs, buttermilk, and 4 tablespoons butter and vanilla, whisk to combine. Batter should have small to medium lumps. Fold in blueberries.
Use pastry brush to brush 1/2 teaspoons butter onto griddle. Use 4 ounce ladel (1/2 cup) to pour batter on griddle. Cook for about 2 1/2 minutes each side.