Spray the bowl of the slow cooker with nonstick cooking spray and set aside.
In a large bowl, toss the red potatoes with the ranch seasoning, salt, and pepper.
Spread half the potatoes in the bottom of the slow cooker.
Top the potatoes with half the butter, half the corn, half the bacon, and half the shredded cheese in that order.
Add the remaining potatoes, butter, corn, bacon, and shredded cheese in layers.
Place the lid on the slow cooker and set to cook on high for 4 hours or low for 6 hours.