In a medium bowl, whisk 1 cup of mayonnaise until smooth and lump-free.
Fold in ½ cup of sour cream with gentle stirring motions.
Gradually pour in ¼ cup of buttermilk while mixing.
Add 1 teaspoon of garlic powder and 1 teaspoon of onion powder, mixing well.
Incorporate 1 teaspoon of dried dill and 1 teaspoon of dried parsley.
Add ½ teaspoon of salt and ¼ teaspoon of ground black pepper, mixing to fully integrate.
Incorporate 2 tablespoons of finely chopped fresh chives.
Blend all ingredients until achieving a homogeneous consistency.
Transfer the dressing to an airtight container and refrigerate for at least 30 minutes.
Before serving, gently stir to reincorporate all ingredients.
