Fudge Marble Cake

1/2 cup or 1 stick of unsalted butter

1 3/4 cups cake flour (not self-rising)
3 large eggs, room temperature 
2 teaspoons baking powder
1/2 teaspoon salt
1 cup sugar
1 teaspoon  vanilla
2/3 cup milk, room temperature
1/4 cup plus 1 tablespoon  cocoa powder
2 tablespoons boiling water

How2:
In a bowl mix dry ingredients except sugar.
In a smaller bowl mix butter and sugar then add eggs.
add dry ingredients bowl into the second bowl followed by the milk,vanilla,salt. mix on med speed until batter has formed.
Set aside a 1/4 cup of batter .
Mix the coco powder with the boil water and pour over the 1/4 cup of batter
preheat the oven to 350DF
In a greased baking pan or loaf pan add the white cake batter.
add some of the chocolate batter on top.
with a knife or tooth pic make swirls. Do not over mix or you will just end up with chocolate cake and no separate layers.
Bake for about 40 Min's until a tooth pic come out clean when inserted into the cake.

TIPS:you may add mini chocolate chips to the chocolate batter or do this cake with different flavors.