1. For Crust: Mix all together until crumbly and press into a 9x13 pan.
2. Bake at 350 degrees for 10 minutes.
3. For Fillling: Mix all together and pour over crust (no need to cool), return to oven and bake for 15 minutes, or until filling is set.
4. For Topping: Melt the Hershey bar with the peanutbutter and butter or margarine and spread over top.
5. Cool completely and cut into bars.