I made potato soup in mine just yesterday!
Dice 8-9 potatoes into 1-in chunks (or however many you want)
1 can of cream of .... (your choice, onion or potato is good)
2-3 cans (of the cream of) of milk
Seasonings (I use garlic powder, salt, pepper, rosemary, onion powder)
optional: add chunks of ham, bacon or some other meat, green onion
Throw it all into the crockpot and cook it on low for about 6-7 hours.
And don't forget to use a crockpot liner for easy cleaning!!