Deciding what to have for dessert can be a difficult decision, especially when you are forced to choose between two delicious treats such as cake and brownies. Lucky for you, you can have your cake, and eat it too—you just need to combine the mixes to create the ultimate dessert. Use a light-colored cake mixture such as vanilla so that you will be able to see the marbled pattern formed by the chocolate from the brownie mix.
Pre-heat the oven to the temperature recommended on your package directions.
Prepare your separate cake mix and brownie mix in two separate bowls by following the directions on the package. Use an electric beater to make sure your mixes do not have any lumps and are thoroughly blended—if you are required to mix the ingredients for a specific time, use a timer for accuracy.
Prepare your cake pans for the mixture. Because you are making twice the amount of mixture, you will need to have twice the amount of space to put it in. Spray both pans with a non-stick spray to avoid sticking.
Spoon a strip of cake mix into the pan, and beside it, spoon a strip of brownie mix. Continue alternating strips until the pans are entirely filled.
Cut the mixture with a knife to swirl the two batters together—the result will have a marbled look. Avoid over mixing or the batters will blend together and no obvious swirl pattern will be visible.