Chocolate marble cake

I've been baking a lot lately haven't I....

CHOCOLATE MARBLE CAKE

www.cooks.com

3/4 c. butter
2 c. sugar
6 egg whites, stiffly beaten
3 c. flour
3 tsp. baking powder
1/2 tsp. salt
3/4 c. milk
1 tsp. vanilla
3 sq. melted chocolate
4 tbsp. sugar
1/4 c. boiling water
1/4 tsp. soda
Cream butter and sugar. Add flour alternately with milk. Add vanilla. Fold in egg whites quickly and thoroughly. To melted chocolate, add sugar and boiling water. Then add soda and stir until thickened. Then divide part in half and add chocolate to one half. Bake at 375 degrees for 25 minutes.

I put a thin chocolate glaze on top