Melt your chocolate chips (I use the microwave…just make sure not to burn it).
In a saucepan, or medium microwaveable bowl, combine milk & marshmallows. Heat & stir until marshmallows are melted. Using a wooden spoon, stir in the vanilla.
Pour over the melted chocolate and stir well.
Scrape into your buttered pan and refrigerate for about 1 hour.
Cut into 1 inch square pieces.
Notes
This is a cross between truffles and fudge. You can dip them in chocolate if you want to.