Line a 9x13” baking pan with wax paper and set aside.
In a large pot over medium low heat, add the butter, peanut butter, and marshmallows. Stir frequently and cook until completely melted.
Take off heat and add the cereal and peanut butter cups. Stir until combined well.
Pour into the baking pan and press down using a greased spatula or more wax paper until it is spread evenly into all the corners of the pan.
Add a few more mini peanut butter cups to the top of the crispy rice cereal treats and press gently.
Put the crispy treats into the fridge while you melt the chocolate.
Cut the Rice Krispies into 24 pieces and dip the bottom edge of each into the melted chocolate and then place on parchment paper or a silicone mat.
Once they are all dipped, add sprinkles or fun sprinkle eyes to them.
Place in the fridge again until chocolate is hardened. You can also place in the freezer to harden the chocolate, but I wouldn’t leave them in there for more than 15-20 minutes.