- Step 1: Combine Dairy Base: In a medium-sized bowl, whisk together the buttermilk, mayonnaise, and sour cream until the mixture is smooth and well combined. Ensure no lumps remain for a creamy texture. 
- Step 2: Incorporate Dry Herbs and Spices: Add the dried parsley, dill weed, garlic powder, onion powder, salt, and black pepper to the dairy base. Stir well to evenly distribute the herbs and spices throughout the mixture. 
- Step 3: Add Vinegar: Stir in the white vinegar. It brightens the flavor profile of the dressing. 
- Step 4: Adjust Seasoning: Taste the dressing and adjust the seasoning as needed. Add more salt or pepper to suit your preference. 
- Step 5: Chill and Thicken: Cover the bowl with plastic wrap and refrigerate for at least 30 minutes, or preferably 1-2 hours. This allows the flavors to meld together and the dressing to thicken slightly. 
- Step 6: Serve: Before serving, stir the dressing to ensure it's well mixed. Serve chilled over salads, vegetables, or as a dipping sauce.
Optional tips: For a richer flavor, use full-fat mayonnaise and sour cream. If fresh herbs are available, substitute 1 tablespoon of fresh parsley and 1 teaspoon of fresh dill, finely chopped, for the dried herbs.