This recipe is from Shirley McNevich's Mom's Best Recipes Vol 2. Published here with her permission.
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(by Shirley McNevich)
3/4 cup butter
2 cups white sugar
1 tsp. vanilla
2 1/2 cups cake flour
2 1/2 tsp. baking powder
1 cup milk
5 egg whites (stiffly beaten)
2 squares Hershey's baking chocolate (melted)
In a mixer, beat the butter and white sugar. Add vanilla and beat. In a separate bowl, sift the cake flour and the baking powder TWICE, then slowly add to the batter along with the milk--beat until creamy. Remove bowl from mixer. In a separate mixing bowl, beat the egg whites until stiff. Fold the egg whites into the batter using a spoon. Melt the chocolate (either in a double boiler or the microwave). Remove one cup of the batter and add it to the melted chocolate and stir. Pour the cake batter into a greased and floured 9 x 13 cake pan. Using a spoon, drop spoonfuls of the chocolate/batter mixture on to the cake. Use a table knife and swirl the chocolate into the white batter until it is streaked with chocolate. Bake at 350 degrees for 35-40 minutes. Cool the cake and frost with your choice of frosting.
 
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