1 1/2 Sugar
2 Baking Powder
Mix together flour, sugar, & butter.
Reserve 3/4 cup of this mixture for topping.
To remainder, add salt, baking powder, vanilla, milk, & egg yolks.
Beat egg whites until firm; fold into batter and pour into 9 X 13 baking pan.
Sprinkle blueberries over top, and then remainder of reserved flour/sugar/butter mixture.
Bake in 350 degree oven for 40-50 minutes.