Preheat smoker to Hi smoke (about 220° F). In a small bowl mix together brown sugar, rosemary, paprika, pepper, salt, garlic, and onion powder, set aside. Mix mayonnaise and mustard together then rub on pork chops, sprinkle with seasoning, repeat on the opposite side. You will have extra seasoning to use on another recipe. Store in airtight jar. Let the pork chops sit at room temperature for 15 minutes. Smoke for 1 hour. Preheat gas grill to high heat to reverse sear pork chops. Sear about 4-6 mins (depending on thickness) flipping and turning after each minute to get sear marks. Cook until instant-read thermometer reads 140-145° F. Remove pork chops and cover lightly with foil. Rest the meat 5-10 min before serving. If you see a little pink in the center but the thermometer reads 145° F, don’t worry! The pork is cooked throughout, and you’re good to eat it. Enjoy!