In my ward in Oklahoma, my friend Sister Aljets makes wedding cakes professionally. They are awesome. I asked her what her secret is and surprisingly, this is all she does to make and awesome and easy cake.
1 Betty Crocker White Cake Mix
1 cup water
1/2 cup oil
3 egg whites at room temperature(Just put your egg in warm water for 10 minutes or so and it will get your egg to room temperature)
Follow the other baking directions on the box and Waaaalaaaa.......You will have a fabulous cake ready to decorate.
You can also use any other Betty Crocker cake mix for this recipe if you would like, just add the 1 cup water, 1/2 cup oil, and get your eggs to room temperature before mixing them in. Your cake will be moist and awesome.