Line crock pot with foil, leaving enough to cover the potatoes when finished – this will help to not stick and to steam the potatoes – also to keep them from getting discolored or mushy.
Layer 1/2 of the bacon, onions and potatoes in the crock pot.
Season to taste with salt and pepper and dot with (real) butter.
Repeat with the OTHER 1/2 of bacon, onions, potatoes and cheese. Dot with butter and cover with foil.
Cover with the lid and cook on low for up to 6 hours (check at 4 hours – depending on your crock pot).
Add cheese for the last 20 – 30 minutes and enjoy!