Marble Layer Cake

Directions

1. 1
   Preheat oven to 350F (180C)
2. 2
   In a large bowl, whisk together flour, baking powder and salt.
3. 3
   In a small bowl, stir together 2 cups (250 mL) of the water and vanilla.
4. 4
   Set both aside.
5. 5
   In a mixer bowl fitted with paddle attachment, cream butter and sugar until light and fluffy, about 3 minutes.
6. 6
   Add egg whites, one at a time, beating for 1 minute between each addition.
7. 7
   Using a wooden spoon, stir in flour mixture alternating with water mixture, making three additions of flour and two of water, just until blended.
8. 8
   Transfer about 1 1/2 cups (375 mL) of batter to another small bowl.
9. 9
   Blend in remaining water and cocoa powder.
10. 10
    Divide white batter evenly between prepared pans.
11. 11
    Using a spoon, drop six large puddles of chocolate batter over top of each pan of white batter.
12. 12
    Using a small knife, drag through puddles in a spiral motion to create a marbling effect.
13. 13
    Bake in preheated oven until a toothpick inserted into center comes out clean, 22 to 28 minutes.
14. 14
    Let cool in pans on a wire rack for 10 minutes before transferring to rack to cool completely.
15. 15
    For best results for decorating, wrap cake layers in plastic wrap and freeze for 1 to 2 days.
16. 16
    Decorate with Old-Fashioned Chocolate Fudge Frosting or any of the icings(see Notes).