Kittencal'S White Cake - cooking recipe

Ingredients

1 (18 ounce) package moist deluxe white cake mix (such as Duncan Hines Moist Deluxe Classic White Cake Mix)
1/3 cup diet lemon-lime soda (such as diet 7-Up or Sprite)
1/3 cup vegetable oil
4 large egg whites
1 cup sour cream

Preparation

Set oven to 350 degrees F (set oven rack to second-lowest position).
Mix all ingredients in a bowl on low speed until blended (about 30 seconds).
Beat at medium speed for 2 minutes more.
Pour the batter into a greased 13 x 9-inch baking pan (the batter will be quite thick so you will need to spread out with back of a spoon).
Bake for about 30 minutes or until cake tests done.