2 3/4 unsalted butter
3/4 cup plus 1 tablespoon milk
10 1/2 cups confectioners' sugar, sifted
Melt butter in a saucepan over medium heat. Remove from heat. Stir in milk.
Whisk together butter mixture and the sugar in a large bowl until icing is opaque and thickened but still pourable, 4 to 5 minutes. Use immediately.
for 10 cupcakes