In food processor, place walnuts. Cover; process, using quick on-and-off motions, until consistency of coarse meal. Add 1/2 cup butter, the blue cheese and pepper; process until combined. Add bread crumbs; process until combined, stopping to scrape down sides as needed. Divide butter mixture evenly among 4 sheets of plastic wrap or waxed paper; flatten each to match width and shape of pork chops, forming 4 disks. Wrap tightly; freeze at least 20 minutes.