Preheat oven to 350°F. Line two muffin tins with 18 paper liners.
Add cupcake ingredients to the bowl of an electric mixer. Mix for two minutes.
Scoop into prepared liners.
Bake for 18 to 22 minutes, or until a tester comes out clean. Let cool completely.
To make the mint Swiss Meringue, add 1/2 teaspoon peppermint and vanilla to the prepared buttercream. Mix until well combined. Taste and add more peppermint if desired.
Add green food color to achieve desired color. Fold in chocolate shavings.
Frost cooled cupcakes and top with chocolate shavings.