Combine flour, sugar, cocoa, ginger, cinnamon, baking soda and cloves in a large bowl. In a separate bowl combine melted butter, molasses and eggs. Add to flour mixture and stir until combined. Batter will be thick. Spread in a greased 13X9X2 pan and bake at 350 degrees for 20 minutes. Do not overbake. Let cool and dust with powdered sugar.