A few drops of pink food coloring (optional for extra color)
2 sticks unsalted butter, softened
3½ cups powdered sugar
4–6 tablespoons heavy cream
1 teaspoon vanilla extract
Green food coloring
Wicked-themed sprinkles
Green narrow disposable baking pans
Instructions
Preheat the oven to 350°F. Place your green baking pans on a flat baking sheet for easy transfer.
In a large mixing bowl, whisk together the cake mix, eggs, oil, milk, sour cream, vanilla, and optional food coloring until smooth. Beat on medium speed for about 2 minutes, until light and fluffy.
Pour the batter evenly into the pans and bake according to the cupcake time listed on the box, or until a toothpick inserted in the center comes out clean. Let the cakes cool completely before frosting.
To make the frosting, beat the softened butter until creamy. Add half of the powdered sugar and mix well. Add the remaining sugar, heavy cream, vanilla, and green food coloring. Beat until fluffy and smooth.
Transfer frosting to a piping bag fitted with a large star tip. Pipe generous swirls down the center of each cooled cake and top with Wicked-themed sprinkles.