1 box moist-style white cake mix (15.25-18.23 oz)
1 1/2 cup flavored seltzer water

Preheat oven to 350 degrees. Spray a 9"x13" baking pan with nonstick spray. In a large bowl, whisk cake mix with seltzer until smooth. Pour into the baking pan.

Bake until a toothpick inserted into the center comes out clean, 35 - 40 minutes.

Slice and enjoy!