Preheat oven to 350 degrees F. Spray a 9x13 pan with non-stick cooking spray and set aside.
In a large mixing bowl, combine flour, 2 cups sugar, baking powder, salt, cinnamon, butter, milk, eggs and vanilla. Mix with an electric mixer on low speed for 2 minutes.
Pour batter into prepared pan. Arrange blueberries on top of batter.
Mix together ½ cup sugar and 1 teaspoon cinnamon and sprinkle over top of the blueberries.
Bake in 350 degree oven for 40 to 50 minutes, or until a toothpick inserted into the center comes out clean.
Recipe by Kitchen Meets Girl at https://kitchenmeetsgirl.com/one-bowl-blueberry-coffee-cake/