My MeMaw [that's Texan for grandma in case you didn't know] used to make this for me and ever since she gave me the recipe I have used it many times to create a dessert that is fast and delicious.
Start with your choice of large chocolate bar. I like to use the symphony bar with the almonds and toffee. Save a few squares to be crushed up for sprinkling over the finished pie. Heat the remaining chocolate in the microwave until melted.
Then mix your melted chocolate with a tub of cool whip. I used light since it was going to be mixed with melted chocolate and placed in a chocolate crust. Save a few calories where you can right?
Now if you want to serve the pie where the mixture is soft or you don't have a lot of time, refrigerate until ready to serve.
The real way is to freeze for a few hours until hard.
I have done both and either way this pie is delicious!