Preheat oven to 375 F. Grease muffin tins or line with paper cups.
In a medium mixing bowl, combine flour, baking powder, salt and apple powder; set aside.
Beat oil, egg whites, sugar, vanilla and butter flavoring until sugar
is dissolved. At lower speed, add water and yogurt; blend well. Add
orange juice. Toss blueberries in small amount of flour mixture. Fold
flour mixture into wet mixture, stir in blueberries. Do not over mix.
Pour batter into muffin tins. Bake 30 minutes. Allow to cool in tins for 5 minutes.
Makes 1 dozen muffins.