Betty Crocker gluten-free chocolate cake (from the box)

Ok, I know that this is a box mix, but I wanted to share what how I had to use an alternative to make my cake.  The cake mix calls for 1 stick of butter, 3 eggs, and 1 cup of water.  I used 1 stick of margarine (it's all I had), 1 1/4 cup milk, and 2 heaping tablespoons of potato starch.  I mixed it in the mixer for a few minutes, followed the rest of the directions, after some time in the oven, out came a yummy chocolate gluten-free cake!  I hope you enjoy it!