Place potatoes in large pot and add enough water to cover potatoes. Cover and heat to boiling; reduce heat to low. Cook covered 25 to 30 minutes or until potatoes are tender. Drain potatoes and let cool completely.

Cut potatoes into cubes.

In a bowl, combine potatoes, cheddar, eggs, celery, green onion, reserving 1 tbsp of the green portion of the onion. In a bowl, mix mayonnaise, sour cream, vinegar, mustard, salt and pepper in a large bowl.

Add the dressing to the potatoes and fold gently, mixing thoroughly. Refrigerate covered for a minimum of 4 hours to allow flavors to combine. When serving, sprinkle crispy bacon and green onion to garnish.