Cupcakes

1 1/2 cups flour

1 tsp baking powder

1/4 tsp salt

1 stick unsalted butter, at room temperature

1 1/8 cups light brown sugar, packed

2 eggs

1/2 cup buttermilk

1/2 vanilla pod, seeds scraped

Frosting

2 sticks unsalted butter, at room temperature

4 cups powdered sugar, sifted

1/2 vanilla pod, seeds scraped

1 tbs espresso powder (dissolved in 1 tbs boiling water)

2-3 tbs milk