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1
Preheat oven to 325 degrees F; grease and flour 3 (8 inch) or 2 (9 inch) round cake pans and set aside.
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2
In a bowl, combine all-purpose flour, cake flour, sugar, brown sugar, cocoa, salt, baking powder, and baking soda, stirring to mix and set aside.
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3
In large mixing bowl, combine mayonnaise and vanilla, mixing well.
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4
Add butter and mix on lowest speed of an electric mixer until well blended.
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5
In another bowl, combine egg yolks, food coloring, and buttermilk.
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6
Add to butter mixture, alternately with flour mixture, at lowest speed, beginning and ending with flour mixture.
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7
Increase mixer speed to medium and beat for 7 minutes and set aside.
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8
Beat egg white to soft peaks at high speed with an electric mixer.
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9
Fold egg white into batter by hand.
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10
Divide batter among prepared cake pans.
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11
Bake for 20-30 minutes, or until wooden pick inserted in the center of each layer comes out clean.
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12
Let layers cool in pan for 10 minutes.
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13
Invert onto cooling racks and let cool completely.
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14
For frosting, in large mixing bowl, beat butter at medium speed with an electric mixer until smooth and creamy.
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15
Add cream cheese, mixing well.
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16
Add confectioners' sugar and vanilla.
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17
Mix on low speed until creamy and smooth.
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18
Frost layers of cooled cake with the frosting.
