Banana Bread Whoopie Pies with Fluffy Vanilla Bean Frosting

INGREDIENTS

2 cups

all-purpose flour

1/2 tsp

baking powder

1/2 tsp

baking soda

1/2 tsp

salt

1 cup

mashed overripe bananas ((about 2 large))

1/4 cup

sour cream

1/2 cup

butter (, softened)

1/2 cup

granulated sugar

1/2 cup

packed light-brown sugar

large egg

recipe Fluffy Vanilla Bean Frosting

1 cup

salted butter (, at room temperature)

seeds from two small vanilla beans I sell them!

4 cups

powdered sugar

2 1/2 tbsp

milk

1 tsp

vanilla extract