Brown ground beef, onion, and green pepper in skillet. Drain. Season with salt and pepper.
In slow cooker, layer one-third of the potatoes, meat, sour cream, and cottage cheese. Repeat twice.
Cover. Cook on Low 4 hours, sprinkling Monterey Jack cheese over top during last hour.
Serve with red or green salsa.
For a cheesier dish, prepare another cup of shredded cheese and sprinkle ½cup over the first layer of potatoes, meat, sour cream, and cottage cheese, and another ½cup over the second layer of those ingredients.