Most crock pots do have 2 settings. The low one is for doing things like overnight simmering, while the high one will do a 2-3 hour job.

I don't use mine often, but my favorite recipe is dead simple...take a whole chicken (a smaller fryer..not a big baking chicken...cover it with water, add some salt & pepper, let it simmer (at whatever setting is relevant) until it falls apart when you try to pull on a leg...then take a couple of slotted spoons and remove the chicken to a large dish.
Put some egg noodles in the pot (you know..a 'bag'). With fork & fingers, remove all 'chicken' pieces from carcass....discard fat & bones, and toss chicken back in with noodles until noodles are done..(20 minutes?) Adjust amount of liquid at each step to avoid boiling over.

Yes, you can experiment with carrots or peas...etc. I just do chicken & noodles.