In a medium bowl, whisk together the yogurt, buttermilk, and sour cream until smooth.
Add garlic powder, onion powder, and salt.
Stir in the parsley, dill, and chives.
Add lemon juice, starting with 1 tsp, and adjust to taste.
Chill in the refrigerator for at least 30 minutes.
Serve as a dip or dressing!
