In a large bowl, mix flour, baking powder, sugar and cinnamon together.
In another bowl, beat milk, egg and oil together. Add the liquid mixture to the flour mixture, and stir until the flour is moistened. Add blueberries and stir gently.
Coat a griddle or skillet with cooking spray and heat to medium-high heat. Pour about 1/4 cup of batter onto the hot griddle and cook until browned. Flip and brown the other side.