Combine a box of your favorite cake mix into a bowl with one 12 oz can of Coca-Cola®.
Stir the two ingredients together.
Pour into a greased pan.
Bake according to the instructions on the box.
Icing
Add 1/2 teaspoon of vanilla and 1/2 teaspoon of peppermint extract to your favorite buttercream icing recipe. That combination gives a perfect peppermint flavor without overpowering the flavor of the cake.