Preheat oven to 350 degrees.

Lightly spoon flour into dry measuring cups; level with a knife. Combine

flour, baking powder, baking soda and salt, stirring with a whisk.

Place granulated sugar and butter in a large bowl; beat with a mixer at

medium speed until blended, about 2 minutes. Add vanilla, egg, and egg

white; beat well. Add flour mixture and buttermilk alternately to sugar

mixture, beginning and ending with flour mixture; mix after each addition.

Spoon half of the batter into a 9-inch round baking pan coated with cooking

spray. Sprinkle evenly with 1 cup of blueberries. Spoon remaining batter

and then remaining blueberries on top. Sprinkle with turbinado sugar.

Bake at 350 degrees for 50 minutes or until a wooden pick inserted into the

center comes out clean. Cool in pan for 10 minutes, then remove from pan

and cool completely on a wire rack.