Some call it Puppy Chow, some call it Christmas Crack...I call it "addictive". It's easy to make, and I guarantee that if you put this out, people are going to keep going back to it.
Unless they are allergic to nuts, in which case, I'd maybe avoid it. That might end badly.
If you are a purist, you'll just use cereal...and that will make people plenty happy. I like a little variety.
What you need...
1 box of Chex (or, if you're in Canada, Crispix)
1 cup thin pretzel sticks, snapped in half
1 cup holiday coloured M & M's
(you can really put anything you like in here...peanuts, almonds, popcorn, whatever...just make sure you have enough coating. It's probably against the law somewhere to skimp on the coating.)
1/2 cup butter
1 1/2 cup milk chocolate chips
1/3 cup peanut butter
1 tsp vanilla
1 big ziplock bag
1 cup icing sugar (confectioner's sugar, powdered sugar, whatever you call it)
In a very large bowl (I usually use 2, so I have room to mix), toss together your snack ingredients.
Lay parchment paper on 2 baking sheets and have them ready.
In a microwave safe bowl, toss in butter, chocolate chips and peanut butter. Nuke on high until melted, stirring often (burnt chocolate is no one's friend). Stir in vanilla quickly, and pour into bowl with all the cereal goodness in it. Mix to coat as best you can, maybe get your hands into it? Whatever works.
Lay out on parchment lined baking sheets to set up 20 minutes or so.
I usually shake the White Trash in 3 batches. Put some powdered sugar at the bottom of the ginormous ziploc bag, scoop some chocolate covered stuff in the bag, top with some more powdered sugar, zip up the bag (securely - it sucks when you *think* it's closed but it's not...ask me how I know) and shake. Feel free to dig into those chunks of chocolate to break them up a bit. Add more sugar if needed.