In a large bowl, mix together the 16 oz sour cream, sautéd onion, 2 teaspoons onion powder, 1 teaspoon garlic powder, 1 teaspoon dried parsley, 1 teaspoon salt, ½ teaspoon worcestershire, and ⅓ cup fresh chives. If you can resist, let it sit for at least 15 before digging in so all the flavors meld together.