Here is the cake recipe that I tried the other day. We thought it turned out great!
1 1/2 cup white rice flour
3/4 cup tapioca flour
1 t salt
1 t baking soda
1 t baking powder
1 t xanthan gum
1 1/4 cup white sugar
2/3 cup mayonnaise
1 cup milk
2 t vanilla extract (make sure it's GF)
Preheat oven to 350
Mix flours, salt, baking soda, baking powder, and xanthan gum, then set aside.
Mix eggs, sugar and mayo until fluffy.
Add flour mixture, milk, and vanilla, mix well.
Bake for 25 minutes.
A few tips I've learned:
*mix batter for 10-12 minutes
*mix milk and rice flour first, set aside while preparing other ingredients
*add a bowl of water to oven to help with moisture
For chocolate cake, add 1/3 cup more sugar and 1/2 cup cocoa powder.