What do you mean by "butter crust"? I haven't eaten at a Pizza Hut in a several years, but I don't remember there being a "butter crust" option. Just traditional pan, thin 'n crispy and hand-tossed.
The Roberta's guy has a "butter crust" recipe that's his take on Pizza Hut Pan pizza from the '80s, but that's officially related to the chain.