Better Than Water: Swap It For This Fizzy Addition, And Give Boxed Cake Mix More Than Flavor

Boxed cake mix is a godsend when it comes to baking a birthday cake in a jiffy, but that doesn't mean you have to follow the instructions to a T. One surprisingly effective upgrade is to substitute the water with soda in your boxed cake mix. This fizzy addition can give an otherwise ordinary boxed cake a little more flavor and pizzazz, and can often fluff up its texture as well. 

The simplest approach is to substitute soda for the water called for in the directions, using the same amount. The fun part is choosing which soda pairs best with which style of cake. A lemon-lime soda such as Sprite or 7Up works particularly well with white, yellow, or lemon cake, while Coca-Cola or Pepsi can complement chocolate cake. Orange soda, like a Fanta, gives this white cake recipe a pronounced citrus character, while root beer adds vanilla and caramel-like notes.  

The most obvious benefit is flavor. Soda contains sugar, acids, and flavor compounds that water doesn't have. Those additions give a relatively neutral cake mix another layer of flavor without needing to drag out six more ingredients. Soda can also subtly affect the texture of the finished cake. Carbonated beverages contain dissolved carbon dioxide, so some of those bubbles can become incorporated into the batter. That's one reason we suggest adding soda to a dump cake: it cuts down on ingredients by adding sugar and leavening bubbles — no baking soda or powder needed. 

However, the more meaningful textural effects will come from the soda's sugar, liquid, and acidity. Replacing water with a sweetened soda adds sugar (or more likely high fructose corn syrup) to the batter, which can contribute to a softer, moister texture. It can also encourage browning on the surface if you want a more deeply colored crust. Acidity plays a role, too. Depending on the soda, the additional acidity can interact with the chemical leaveners in the mix, creating a lighter crumb.

Of course, using soda in cake mixes isn't a new trend. Especially in the American South, 7Up cake is a vintage recipe that's been traced back to the mid-century. Typically made with a yellow cake mix and baked in a Bundt pan, it's often topped with a lime, lemon, or 7Up sugar glaze. One important catch: not all sodas are interchangeable. A very strongly flavored soda can overwhelm a delicate cake, while a highly sweet soda can be a sugar overload if the cake is already sweet on its own. If you're up for experimenting, a mild lemon-lime soda is a good place to start. 

For the best results, think of soda as a flavoring ingredient that replaces the water, not the secret ingredient behind a better cake overall. No matter which bubbly beverage you choose, it will certainly give any basic boxed mix a much more interesting personality.