Moscow Mule Cupcakes

Ingredients

• 1 box white cake mix
• 1 (12 ounce) can ginger beer
• 1/2 teaspoon ground ginger
• 2 sticks butter, softened
• 4 cups powdered sugar
• 1/4 cup vodka
• 1 tablespoon lime zest
• 2 tablespoons lime juice