This is a great question and I'm sure it's entirely possible. However, at this point I haven't tried my hand at recipe testing this option so can't give specifics. However, I have heard of people having great success caramelizing onions in a Crock-Pot so I'm sure it's entirely possible to do that portion in your slow cooker for a few hours. Separately, sear the chops on the stove top, and then transfer them into the slow cooker with the onions to simmer for a few hours more and finish cooking through is my rough guesstimate.