Whisk flour, baking powder and salt in a bowl, set aside

Beat butter, , sugar and egg yolks togetherl until creamy, add vanilla and buttermilk. Add the flour mixture and blend well

Remove half of dough to another bowl

Color one bowl of batter blue with the blue food color. Color the other red with the red food volor

Drop by 2 tablespoon fulls 2 inches apart on prepares pans. Smooth tops a bit

Bake until they spring back when touched 10 to 12 minutes. Cool on rack in pan 5 minutes then transfer to racks to cool completely

Beat butter until smooth, add remaining ingredients and beat until creamy

Sandwich strawberry cream between one blue and one red cake

To finish whoppie pies, Spread sprinkles on a plate

Roll edges of filled whoppie pies in sprinkles to coat egdes