Melt a semi-sweet chocolate bar in microwave. After melted, mix 12 oz cool whip until well blended. Pour the mixture into a chocolate pie crust and place in the freezer until hard. Before serving spread cool whip on top.
Use wither graham cracker crumbs or chocolate cookie crumbs mixed with enough butter to hold it together to make the crust. Make a chocolate mousse or pudding from a kit and mix in crumbled up pieces of the chocolate bars. Let this set and then coever with Cool Whip