Add the blue cheese, whole milk, and vinegar to a small mixing bowl and mash together with a fork until the blue cheese is in small, creamy pieces.
Add the mayonnaise, sour cream, parsley, garlic powder, and sugar and stir well to combine.
Taste and add salt and fresh cracked pepper to taste. We use around ½ teaspoon each. Add additional milk, if needed, to reach your desired consistency.
Store in a mason jar in the fridge for up to 1 week.
Notes
You can use buttermilk for a stronger, tangier flavor.Swap the vinegar for lemon juice or apple cider vinegar, if preferred.If you’re using dried parsley, you’ll need around ½ teaspoon.To make this dressing more smooth instead of chunky, pop everything into a small blender and blend until smooth.This makes around 1 cup of dressing.