Grease the 13 X 9 pan

Spread the mini peanut butter cups on the bottom of the pan

In a microwavable bowl, heat the butter and marshmallows on high for 1 minute

Take it out and stir and reheat if necessary until both are melted

Transfer the mixture to a very large mixing bowl

Stir in the crispy rice cereal until it is all coated

Spread the mixture into the pan until the chocolate covered bottom is coated and make sure you push it into the corners

In a medium microwave safe bowl, place the chocolate chips and microwave on high for 1 minute

Stir well to make sure the chocolate is completely melted

Spread all over the top of the crispy cereal treats mixture

Let cool

Bring on the gummy worms!

Let the kids place whichever way they want

Cover the treats and set aside until firm

Cut into squares and enjoy!