Combine powdered sugar and cocoa in medium mixing bowl. Add butter and milk and mix well. Spread over pound cake.
In a large mixing bowl cream together butter, sugar and vanilla for five minutes.
Add eggs one at a time beating after each addition.
In a separate medium bowl, combine flour, cocoa, salt and baking powder and add alternately with buttermilk to creamed mixture, beating just until blended. Stir in chocolate chips to batter.
Pour into 3 grease and floured loaf pans (8 x 4 x 2.5 inch).
Bake at 325 degrees F for 45 to 50 minutes or until done. Insert a toothpick, if it comes out clean it is done.
