Mix all together (1 heaping cup graham cracker crumbs, 1/4 cup unsalted butter, melted 1/4 cup Xylitol) and press into your pan.
2nd Layer: 1 pkg (8 oz) light cream cheese, softened, 1/2 scant cup powdered sugar, 1/2 large tub of light cool whip, 1 tsp pure vanilla, 1/2 cup all natural creamy peanut butter. Whip this all together in a bowl and spread over crust.
Mix together according to package directions, and pour over 2nd layer. Set in refrigerator for 15 minutes to firm up the pudding.
4th Layer: spread the cool whip gently over the 3rd layer, then sprinkle the top with Heath bits. * If desired, you can drizzle it with chocolate syrup or caramel syrup.