Chop potatoes into bite sized cubes and boil for 10-15 minutes or until they are tender and can be pierced with a fork.
Drain and rinse potatoes and pace in a large bowl.
In a separate bowl, mix mayo, milk and ranch powder until well combined.
Mix dressing mixture with potatoes until evenly distributed.
Combine celery, cheese, bacon and onions with the potato mixture and toss to coat.
Enjoy!