Preheat oven to 350°.
Prepare a cupcake pan by adding 12 cupcake liners.
Combine cake mix, oil Prosecco, and egg whites in a large mixing bowl.
Beat for 3 minutes on medium speed.
Bake for 17 minutes or until an inserted toothpick comes out clean.
Let them cool for 1 hour before frosting with Prosecco Buttercream.