Combine all ingredients into a bowl and stir together until well combined. For best results, let refrigerate for at least a few hours before using or serving.
If dressing gets too thick, simply add additional milk or buttermilk until desired consistency is reached.
Calorie count is for one serving. The recipe makes about 1.5 cups of ranch dressing and I figure each serving is usually about 1 1/2 tablespoons. So you can get 16 servings from the recipe.