Spray two 9 inch round cake pans with nonstick spray. Preheat oven to 350 degrees C (175 degrees C).
In large mixing bowl, sift together flour, cocoa, sugar, baking soda, baking powder, and salt.
In medium bowl, stir together milk, prunes, vanilla, egg whites or egg mixture, and coffee. Pour moist ingredients into dry, blending well. Divide batter equally between pans.
Bake for 30 to 35 minutes, or until toothpick comes out clean. Let cool ten minutes in pan. Invert on wire rack, cool.
