Combine Greek yogurt, buttermilk, lemon juice, half of the blue cheese, salt & pepper in a pint sized mason jar, place the lid on and shake well. Set aside
Make the salad
In a large bowl, add chopped eggs, bacon, tomato, avocado, and the remaining blue cheese.
Pour the dressing into the salad and gently mix well to combine.
Serve over lettuce cups, whole grain toast, or English Muffins.