his idea would work, velvita(sp) has a VEARY high fat content, and that shit melts into a nice puddle of goo. i would break up like a gram, or a half gram. cut up the cheese into small cubes, then put some cheese in a bowl bud on that, finaly more cheese. you got to cover the bud, if it burns you loose the thc. you could mix all kinds of stuff with it. cooked hamberg, refried beans, scallans, jalapeno peppers. nuke it for like 2-3 min, eat it like a dip, or pour it over chips like nachos.

alternitive (coventonal oven)
using a glass pan, or a cookie sheet(for many guests)
line the pan with tin foil, spred some chips out. break up your bud 1 gram for like 1-2 people, spred it out over ALL the chips. a thick layer of shredded cheese, you must make sure to cover all the bud or it will burn. next preheat your oven to like 250 cook it for like 5-10 min, or untill the cheese is all melted. the tin foil will allow for easy removal, and clean up, let cool, eat enjoy.
use like a 1/4 for the big cookie sheets.