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1
Preheat oven to 350F.
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2
Coat 3 8-inch round cake pans with cooking spray.
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3
To make Cake:
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4
Sift together rice flour, coconut flour, cocoa, baking powder, baking soda, xanthan gum, and salt in large bowl.
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5
Whisk together buttermilk, applesauce, and sour cream in small bowl.
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6
Cream margarine and sugar with electric mixer 2 minutes, or until fluffy and smooth.
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7
Add eggs 2 at a time, then egg whites, beating well before each addition, and scraping down sides of bowl with spatula between additions.
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8
Beat in vanilla extract.
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9
Add one-third flour mixture to butter mixture and beat until smooth.
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10
Add one-third buttermilk mixture, and beat until smooth.
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11
Alternate adding flour mixture and buttermilk mixture until all ingredients are combined.
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12
Divide batter among prepared cake pans.
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13
Bake 25 minutes, or until toothpick inserted in centers comes out clean.
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14
Cool 10 minutes, then unmold, and cool completely.
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15
To make Frosting:
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16
Beat margarine and cream cheese with electric mixer until smooth, scraping down sides of bowl, if necessary.
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17
Beat in confectioners sugar 1 cup at a time until smooth, thick frosting forms.
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18
Frost Cake with 3/4 cup frosting between each layer and remaining frosting covering top and sides of Cake.
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19
Decorate with candies, if desired.
