Boston Cream Pie Cupcakes

INGREDIENTS

4 tbsp

unsalted butter, softened

1/4 cup

granulated sugar

1 tsp

vanilla extract

large egg white, at room temperature

2 tbsp

sour cream, at room temperature

6 tbsp

flour

1/2 tsp

baking soda

fine salt

!For the filling:

box Jell-O Instant Vanilla Pudding Mix

1 1/2 cups

cold milk

!For the frosting

2 oz

unsweetened chocolate, chopped

4 tbsp

unsalted butter, softened

1 1/2 cups

powdered sugar

1 tbsp

sour cream

1/4 cup

cocoa powder