In a large mixing bowl, combine flour, baking powder, baking soda, and salt.
Whisk in milk, maple syrup, and vanilla extract.
Fold in blueberries.
Pour batter into a 9”x11”, nonstick baking dish. Bake for 40 minutes, or until completely baked in the center. Using a toothpick to test, if it comes out clean, you are all set.