Refrigerate for at least one hour to allow the onion soup mix to soften and the flavors to blend together.
Serve with chips (I'm partial to Ruffles).
Notes
You can make the dip a day in advance (the flavors will get even better that way). Cover tightly and refrigerate until you're ready to serve it. Doctor it up: Some readers suggested adding an additional 2 tablespoons of onion soup mix to the dip (from another packet) for an even bolder onion flavor. Sounds good to me! You could also doctor it up with some onion powder, parsley flakes, or garlic powder. And if you like some heat, a little cayenne pepper!