Spray a 9 x 13 pan with nonstick cooking spray.
Melt butter on low heat in a large saucepan.
Add mini marshmallows and once marshmallows begin to soften and melt, add peanut butter and constantly stir the mixture so the peanut butter does not burn.
Once, mixture is combined and melted, turn off heat and remove pan from stove.
Add rice krispie cereal to sauce pan and stir until evenly coated with mixture. (Make sure not to add more rice krispie cereal than the recipe calls for or they won’t be soft and chewy)
Pour mixture into 9 x 13 pan, and pat down mixture with parchment paper, pressing it on top of the mixture and patting down or spray your hand with some nonstick cooking spray and pat down the mixture until firmly compacted. Allow 30-45 minutes for treats to firm up before cutting.
Cut into 8 even rectangular bars.
Place white chocolate in microwave-safe container. Microwave up to 2 minutes, and within the 2 minutes, microwave at 15 second intervals and stir until smooth. Overheating will cause wafers to burn. Add some black color gel and swirl to get a granite affect. Dip and lay on a wire rack for decorating one a time.
Add the Nestlé Butterfinger Peanut Butter Cup Skulls to the top of the tombstones
Add some decorative sprinkles or cookie crumbles to the bottom of the tombstones.
After all the tombstones are sprinkled and skulled, it's time to do the do the 'RIP' lettering.
Melt some dark chocolate and it's optional, but you can add some back color gel to this to give it a darker vibe and fill a ziploc bag, then snip the tip with scissors to create a tiny opening. and using a toothpick, mark the beginning and ending of RIP in a straight line.
This will help keep you centered when you start to pipe.
Trace the letters with the chocolate.
Let treats set and devour when ready to serve!
Let treats set overnight if you are packaging to send off to little ghouls in the mail.