Make a Fluffy Cake With Fruit

• One of the simplest ways to transform a box cake mix into an eggless dessert is to substitute fruit for the eggs. Applesauce and pureed banana are mild enough in flavor to replace your cake’s eggs without altering the flavor greatly. Substitute 1/4 cup of unsweetened applesauce for every egg called for in the recipe. If you prefer bananas, one pureed banana can take the place of one egg. Although other fruit may be used in cake mixes, such as pureed pumpkin or prunes, they have too strong of a taste to work well with the flavors in a yellow cake, so steer clear.

Strengthen Your Cake With a Starch

• Among other qualities, eggs give structure and leavening to baked goods. Because they firm up when heated, eggs help hold the other cake ingredients together. Substitute a plant-based starch to achieve the same results, minus the cholesterol from eggs. Two tablespoons of potato starch can take the place of each egg called for in the recipe. Arrowroot powder also acts as a binding agent similar to eggs. Substitute 2 to 3 tablespoons for each egg.

Delight With Dairy Products

• If staying away from animal products isn’t the motivating factor for eliminating eggs in your yellow box cake, use plain yogurt as a substitute. Use 1/4 cup of regular or Greek yogurt in place of each egg in the recipe. Add about 1/2 teaspoon of baking powder to the mix to keep the cake from being too heavy. Buttermilk can also be used in place of eggs at about 1/4 cup of buttermilk per egg. If you use buttermilk, don’t add any other liquid to the recipe because it will be too moist.

Make It Delicious With Diet Soda

• Although it may seem unconventional, diet soda makes for a light and fluffy egg substitute. Like eggs, diet soda gives baked goods a springy, spongy texture. When making up the yellow box cake, use diet cream soda for the best flavor. Diet lemon-lime soda is also a good choice, and it will give your cake a fresh citrus taste. The bonus is that diet soda doesn’t add any calories or sugar to the recipe, instantly making it a better choice if you're watching your weight.