Mint Chocolate Cupcakes

Name: Mint Chocolate Cupcakes
Prep time: 20 min
Cook time: 20 min
Total time: 40 min
Cuisine: American
Ingredients: 1 1/4 cup cake flour (substitute all purpose flour); 1 cup granulated sugar; 1/2 cup unsweetened cocoa powder; 1 1/2 teaspoons baking powder; 1 teaspoon espresso powder (optional); 1/2 teaspoon salt; 1/2 cup vegetable oil (substitute canola oil or light olive oil); 2 large eggs (room temperature ); 1/2 cup whole milk; 2 teaspoon peppermint extract; 1/2 teaspoon vanilla extract; 1 cup unsalted butter (room temperature ); 3 cups powdered sugar; 4 ounces white chocolate (melted and cooled); 1 teaspoon peppermint extract; 2-3 drops green food coloring (optional); 1-2 teaspoons milk (if needed); thin mint cookies (or Andes mints); chocolate shavings; fresh mint