Luscious Lemonade Layer Cake

Directions

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