1. **Mix Base Ingredients:** In a medium bowl, whisk together the mayonnaise, sour cream, and buttermilk until smooth and well combined.
2. **Add Lemon Juice:** Stir in the fresh lemon juice.
3. **Incorporate Herbs:** Add the chopped parsley, chives, and dill to the mixture.
4. **Season:** Sprinkle in the garlic powder, onion powder, salt, and black pepper. Stir until all ingredients are thoroughly mixed.
5. **Adjust Consistency:** If the dressing is too thick, add a little more buttermilk until you reach your desired consistency.
6. **Refrigerate:** Transfer the dressing to a jar or an airtight container. Refrigerate for at least 30 minutes to let the flavors meld together.
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