Preheat oven to 325.
To prepare crust in md. sauce pan over very low heat. Melt choc.
chips and butter stirring until very smooth. Stir in graham crackers.
Remove 1/4 mixture for later use.
Press into a 9 x 13 pan.
Mix the remaining ingredients and spread over top. Sprinkle 1/4 cup
mixture on top.
Bake 325 for 25-30 mins.
Cool then refrigerate 2 hours at least.