Mojito Cupcakes

INGREDIENTS

• :
• ½ cup buttermilk
• ½ cup mint leaves, bruised
• 1½ cups all-purpose flour
• 1½ teaspoons baking powder
• ¼ teaspoon salt
• ½ cup unsalted butter, at room temperature
• 1 cup granulated sugar
• 2 eggs, at room temperature
• Zest and juice of 1½ limes
• 2 tablespoons white rum
• ¼ teaspoon vanilla extract
• 2 sprigs fresh mint
• 1½ cups unsalted butter, at room temperature
• 4¼ cups powdered sugar
• 1½ tablespoons lime juice
• 3 tablespoons white rum