1 (18 ounce) package moist deluxe white cake mix (such as Duncan Hines Moist Deluxe Classic White Cake Mix)
⅓ cup diet lemon-lime soda (such as diet 7-Up or Sprite)
⅓ cup vegetable oil
4 large egg whites
1 cup plain Greek yogurt
Instructions
Set the oven rack to second-lowest position and preheat oven to 350 degrees Fahrenheit.
Grease a 9 x 13-inch baking pan or two 8-inch round pans and set aside.
With an electric mixer on low speed, beat all ingredients together in a large mixing bowl for approximately 30 seconds. Increase to medium speed and continue beating for 2 minutes more.
Pour and spread the batter evenly in prepared cake pan(s) (Batter will be quite thick).
Bake for approximately 30 minutes or until a toothpick entered in the center of the cake comes out clean.
Notes
You can use regular instead of diet soda pop, but the regular soda is too sweet for me. It's your preference. Also, don't allow the soda pop to go flat--pour it right from the bottle or can.
Recipe by The 36th AVENUE at https://www.the36thavenue.com/white-cake-recipe/