In mixing bowl, blend flour, sugar, baking soda and salt. In separate bowl, mix hot butter and cocoa powder until smooth. Stir egg and milk into chocolate mixture. Pour wet mixture over flour mixture. Fold through gently with a rubber spatula until all of flour mixture is moistened. Do not try to make a smooth dough. Place dough on sheet of wax paper and push into a rectangle of approximately 10-inch x 5-inch. Chill dough for about 15 minutes. Cut out as many shapes as you can from dough (this should be between 8 and 10). Transfer these to a baking sheet lined with parchment paper. Bake at 400° on center rack for about 12 minutes, or until tops have dried and started to crack and bases have started to color. Serve with cream and berries or jam.