- In a mixing bowl, add the mayonnaise and sour cream. 
- Whisk them together until they are well combined and smooth. 
- Gently pour in the buttermilk while whisking continuously. 
- This helps avoid any lumps and ensures a consistent texture. 
- Add garlic powder, onion powder, salt, and black pepper to the mixture. 
- Mix thoroughly to integrate all the flavors. 
- Stir in the fresh chopped dill and parsley. 
- These herbs add an essential freshness to the dressing. 
- Transfer the dressing into a jar or airtight container. 
- Let it chill in the refrigerator for at least two hours to allow flavors to meld.