Add the mayonnaise, sour cream, and buttermilk to a medium mixing bowl. Whisk until smooth.
Add the garlic powder, onion powder, dried dill weed, dried parsley, dried chives, kosher salt, and black pepper. Whisk until the seasonings are evenly incorporated.
Stir in the lemon juice and white vinegar. Taste the dressing and adjust the salt or seasoning as needed.
Transfer the ranch dressing to a mason jar or another airtight container with a tight-fitting lid.
Refrigerate for at least one hour before serving. Stir or shake well before using.