This is an easy vegan version of the ubiquitous ranch dip you find at any gathering in the middle of the veggie tray. That veggie tray is often the only thing at some parties for the vegetarians and vegans, so we often hit it first. Many times it is not vegetarian friendly because some store-bought dips have gelatin in them, and almost none of them are vegan.
I found this recipe on a website, I think it was VegWeb.com but I'm not completely sure.
All that needs to be done is to take the spices and mix them into the vegan sour cream or vegan mayo and then chill it for a while before serving.
Often I'll use this as a guide and approximate the amounts of each spice. Tofutti vegan sour cream has given me the best results so far.

Quick Vegan Ranch Dip:
1 cup vegan mayo or vegan sour cream
2 teaspoons parsley
1 teaspoon onion powder
1/2 teaspoon garlic powder
1/2 teaspoon salt
dash of dill weed
black pepper to taste