Mash rosemary, pepper, salt, and garlic to a paste.
Trim fat from chops. Rub garlic mixture over both sides of chops; cover and chill 30 minutes.
Place chops on rack of a broiler pan coated with cooking spray. Broil 5 1/2 inches from heat (with electric oven door partially opened) 5 to 6 minutes on each side or to desired degree of doneness. Garnish with fresh rosemary sprigs, if desired.