Preheat griddle to 350°F.
In a bowl whisk together flour, cornmeal, sugar, baking powder, baking soda, and salt; set aside.
In a second bowl, combine eggs, milk, sour cream, oil, and vanilla. Whisk wet ingredients into the dry ingredients until moist (do not over mix; a few lumps are okay).
Lightly coat griddle with nonstick spray, then pour 1/3 cup batter per cake onto griddle. Place some blueberries in each griddle cake. When the cakes appear dry on the edges and bubbles appear on the surface, turn over with a spatula and continue to cook until done.
Serve griddle cakes warm with your favorite topping.