Total Calories: 3,665
Preheat oven to 350°F. Grease a 9 x 13-inch cake pan.
In a medium bowl, combine flour mixes, xanthan gum, baking powder, baking soda, and spices. In a large bowl, cream together the margarine, shortening, sugar, and vanilla. Add eggs, beating well after each.
Alternately add flour mixture and sour cream to egg mixture, beating each addition on low until combined.
This batter will be quite thick...much more like cookie dough than cake batter. Don't worry! Transfer the batter to the prepared pan, and spread it out evenly. If you get your hands wet, you will be able to use them to spread the batter without having it stick to your hands.
Bake for 35 to 40 minutes. Frost as desired.
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