Slow Cooker Pork Chops with Cranberries & Leeks

bone-in pork chops (1/2-inch thick)

salt

ground pepper

olive oil, divided

leeks, white parts only, cut in half lengthwise and thinly sliced (see [url]How to: Prepare a Leek∞https://www.cookincanuck.com/2011/04/how-to-prepare-a-leek/[/url])

fresh or frozen cranberries

chopped fresh rosemary

dry vermouth

chicken or vegetable broth

pure maple syrup