I'm not sure it really counts as roasted if it's done it a slow cooker. These are very good.
3 T olive oil
1T fresh Rosemary chopped
3 cloves garlic chopped 3-4 lbs red potatoes
Put oil into vita clay . Slice potatoes into chunks that are less than 1/2 an inch thick. Add chopped rosemary and garlic as well as salt and pepper. Mix well and set to cook 2 hours on the stew/braise/porridge setting. I don't know if this would work in a dutch oven- but this preparation alone makes owning a vita clay worthwhile.