Wash the potatoes and cube. If you want to peel the potatoes you can but it is not a must.
Fill a pot with cold water and add the potatoes to the water.
Over high heat bring the potatoes to a boil and boil potatoes in a pot until they are soft enough that you can stab them with a knife easily about 15 minutes), then drain.
While potatoes are cooling cook bacon on the stove until crispy then drain on a paper towel and once cooled crumble into little pieces and set aside.
Dice the large red onion and shred the cheese if needed and set aside.
In large bowl mix potatoes, bacon, cheese, onion and ranch dressing. Mix everything well and be sure everything is coated well with the ranch dressing.
Put the potato salad in the fridge for about 30 minutes to cool the rest of the way.