Very similar to recipe on Marshmallow 'fluff' jar or that puff"?. The milk and sugar are put on with the butter, and brought to a boil, and soft candy stage, 240 degrees on a candy thermometer , then stir in the vanilla, chips and marshmallows and quickly whip until the candy is not longer 'shinny' looking...put into plate or pan to get hard. You can change out the chips for other flavors, e.i, butterscotch, peanut butter, vanilla....