melt butter in a large stock pot
Add marshmallow fluff to melted butter and stir them together
add in Rice Krispies and mix thoroughly
Thoroughly and evenly mix the marshmallows and Rice Krispies together.
Spread the mixture into a greased pan with a greased spatula.
Allow mixture to cool (about 30 minutes)
spread a layer of peanut butter across the top of the pan of treats
sprinkle mini marshmallows on top of peanut butter
cut into squares and enjoy!