buttermilk ranch dressing

Anne made this homemade version of buttermilk ranch dressing and it was perfect.  She said she'd tried other recipes but was never pleased with them but was content with this one.  It went splendidly with the Honey Baked ham she brought to the Thanksgiving table (which she stood in line for over an hour for...it was worth it).

buttermilk ranch dressing (Our Best Bites)
1 cup mayo (no substitutes)
2/3 cup buttermilk
1/4 teaspoon white vinegar
1 teaspoon parsley
1/8 teaspoon dill
1/4 teaspoon garlic powder
1 1/4 teaspoons dried chives
1/8 teaspoon black pepper
1/4 teaspoon seasoned salt
1/8 teaspoon dry mustard

Whisk mayo and buttermilk until the texture is lump free.  Whisk in remaining ingredients.  Refrigerate for at least 4 hours before serving.