1. Finely chop 1/3 cup mini Oreo cookies (about 10 cookies); fold into batter. To frost: Beat 1/2 cup (1 stick) softened unsalted butter, 2 cups confectioners sugar and 2 tbsp milk. Crush 8 mini Oreos and fold into frosting. Spread frosting over cupcakes and top each with a mini Oreo.