Add the 1 cup butter and 3 cups confectioners sugar into a bowl of a hand or stand mixer fitted with the paddle attachment and mix on low speed for 1 minute.
Move to medium speed and beat for another minute.
Stop the mixer and scrape down the bowl.
Add the teaspoon vanilla extract, 2 tsp peppermint extract, 2-3 drops green dye, and 2 teaspoons milk and mix again on medium high speed for 1-2 mins.
If the frosting is too thick add 1 tsp milk at a time until desired consistency. If too thin, add ¼ cup confectioners sugar until desired consistency.
Frost over 12-15 cupcakes or a 6” chocolate cake.
