In a small sauce pan on low heat, melt butter.
Add in marshmallow fluff, stir continuously until butter and fluff are well incorporated and the fluff melts down.
Add in Rice Krispies. I started with a ½ cup, then stirred and checked the consistency before adding the additional ⅛ cup. You want all the cereal to be well coated but not drowning in it.
Let cool slightly before adding chocolate chips.
Put mine in a grease ramekin.
Let sit for at least an hour or two. I let mine sit two hours.
