In a bowl, add mayonnaise, sour cream, and apple cider vinegar. Stir to combine.
Add parsley, dill, garlic powder, onion powder, salt, and pepper and stir until evenly incorporated.
Dip is ready to enjoy immediately, but for best flavor, refrigerate for 1 hour to allow flavors to meld and herbs to rehydrate before serving.
Notes
Storage: Leftover dip will keep for up to 2 weeks in the refrigerator.
Refrigeration: Dip should not sit out at room temperature for more than 2 hours. Leftover dip sitting at room temperature for more than 2 hours should be discarded.
Fresh herbs: Substitute fresh herbs at a 3:1 ratio of fresh to dry herbs.