In a medium mixing bowl, combine sour cream, mayonnaise, dry au jus mix, and dry ranch seasoning. Stir until the mixture is smooth and evenly blended.
Add the chopped pepperoncini and pepperoncini brine to the bowl. Fold gently to fully incorporate.
Spoon the dip into a serving bowl and top with extra chopped pepperoncini for garnish.
Cover the bowl with plastic wrap and refrigerate for at least 30 minutes to allow the flavors to develop.
Serve chilled with potato chips.