Preheat the oven to 350° In a large bowl combine the flour, cornmeal, corn flour, sugar, and baking powder; mix well, breaking up any lumps. In a separate bowl combine the milk, butter and egg and add to the dry ingredients; blend just until mixed and large lumps are dissolved. Do not overbeat. Pour the mixture into a lightly oiled baking pan and bake at 350° until golden brown, about 40-55 minutes. Remove from pan, cool and break into crumbs (not too fine, and leave some coarser chunks for texture).