1Heat oven to 450°F. Spray rack in shallow roasting pan with cooking spray. Place lamb on rack in pan.
2In small bowl, mix remaining ingredients. Spread mixture over meaty side of lamb.
3Bake uncovered 25 to 30 minutes for medium-rare (145°F), 30 to 35 minutes for medium (160°F). Cover loosely with foil; let stand 5 minutes before slicing. Slice between ribs to serve.