In a medium bowl, whisk together the sour cream, mayonnaise, and buttermilk until smooth.
Finely chop the fresh parsley and dill, then add them to the mixture.
Add the garlic powder, onion powder, salt, and pepper. Mix well to combine.
Refrigerate the dressing for at least 30 minutes to allow the flavors to meld.
Serve with fresh salads, vegetables, French fries, or chicken dishes.
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