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1
Preheat oven to 350u00b0F.
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2
To prepare cake: Place first 5 ingredients in a large bowl; beat with a mixer at medium speed until well blended (about 5 minutes).
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3
Add eggs and egg whites, 1 at a time, beating well after each addition.
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4
Combine flour, baking powder, salt and baking soda; stir will with a whisk.
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5
Add flour mixture and buttermilk alternately to sugar mixture, beginning and ending with four mixture; beat well after each addition.
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6
Cut a circle of parchment paper for bottom of 2 (9-inch) round cake pans and spray sides with cooking spray.
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7
Divide batter between pans.
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8
Sharply tap pans once on counter to remove air bubbles.
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9
Bake at 350u00b0F for 20 minutes or until wooden pick inserted in center comes out clean.
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10
Cool in pans 10 minutes on a wire rack; remove from pans.
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11
Cool completely on wire rack.
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12
To prepare frosting: Place 2 tablespoons butter and the next 4 ingredients in a large bowl; beat with a mixer at high speed until fluffy.
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13
Add powdered sugar and beat at low speed just until blended (do not over beat).
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14
Chill 1 hour.
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15
Place 1 cake layer on a plate; spread with 1/2 cup frosting.
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16
Top with remaining cake layer.
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17
Spread remaining frosting over top and sides of cake.
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18
Store cake loosely covered in the refrigerator.
