Skip The Oil And Eggs: Add A Can Of Diet Coke To This Cake Mix For The Easiest Dessert

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Boxed cake mix is hard to beat when you need a dessert in a hurry, or if you just don't back your baking abilities. One of our favorites is Duncan Hines Devil's Food Cake, available on Amazon, which came in second in our boxed cake mix ranking. Like most packaged options, it comes with all the dry ingredients pre-measured, leaving you to add water, eggs, and vegetable oil. However, just because the instructions are printed on the back doesn't mean you have to follow them to the letter. In fact, you can swap all three for a can of Diet Coke and still come out with a soft, fluffy cake.

To understand why this works, it helps to know what eggs and oil actually do. Egg whites provide proteins that coagulate as the cake bakes, forming a structure that holds the batter together and helps trap the air responsible for its fluffy crumb. The fat from oil and egg yolks coats the flour particles and inhibits gluten development, helping produce a softer, more tender texture. Diet Coke also contributes to the cake's crumb and tenderness, but in a very different way.

Diet Coke's secret weapon is its carbonation. It contains dissolved carbon dioxide, which forms tiny bubbles when added to the batter. As the cake heats up in the oven, these bubbles expand and help the mixture rise. The soda's acidity can also react with leavening agents present in the mix, such as baking soda, further contributing to the cake's light texture. To top things off, a standard 12-ounce can of Diet Coke contains roughly the same volume as the combined water and oil that Duncan Hines' mix calls for, making it a super convenient add-in. If you don't have Diet Coke on hand, Coke Zero is a near-identical substitute. 

To get the most out of this swap, start with a can of cold Diet Coke over one that's been sitting at room temperature. Ever noticed how a can of cold Diet Coke has that unbeatable crispness? That's because carbon dioxide prefers to hang around in cold liquids over warm ones. Once a soda can is cracked open, it releases gas, so a cold one retains its carbonation better as you prepare your batter. On that note, avoid over-mixing the batter as this can knock out the trapped gas. If you notice bubbling, that's a telling sign you need to slow down.

When swapping oil and eggs for Diet Coke, there's one important difference worth noting. Diet Coke famously contains no fat, so while it can help the cake rise, it can't replicate the richness that oil brings to the table. It's a great substitution if you're looking to make a lighter, less calorie-dense cake. But for something that'll produce a richer cake with all the same effects as Diet Coke, reach for good old full-sugar Coke instead. 

Diet Coke gets its sweetness from aspartame, an artificial sweetener, which loses its sweetness when exposed to heat. Regular Coke opts for high-fructose corn syrup, which is essentially liquid sugar. Unlike aspartame, high fructose corn syrup thrives under heat, and is already a baking superstar. In the oven, its resident sugars caramelize to give the cake a richer flavor, gooier texture, and a beautifully browned color. In fact, any soda will work wonders for boxed cake mix; for a similarly rich flavor profile with a cherry backbone, pick up a can of Cherry Coke or Dr Pepper, or for something brighter, go for Sprite or 7UP.