Add Buttermilk, sour cream, lemon juice, vinegar and half of the blue cheese crumbles to a pint mason jar. Using a fork, smash up the cheese while mixing together.
Add all remaining ingredients EXCEPT the remaining blue cheese to the jar and secure the lid. Shake vigorously for about 2 minutes.
Add remaining blue cheese and shake well. Store in refrigerator for up to 10 days.
Keyword blue cheese, blue cheese dressing, buttermilk, lemon juice, mayo, mayonnaise, sour cream