Preheat oven to 350 degrees. Mist a 12-cup standard muffin tin with nonstick spray. Combine the dry ingredients in a bowl and mix well. In a separate bowl, combine the wet ingredients (except blueberries) and mix well. Pour into the dry ingredients and mix well with a wooden spoon. Fold in blueberries. Immediately spoon batter into muffin cups. Bake for 20-25 minutes or until toothpick comes out clean.