Combine first 4 ingredients in a shallow bowl; stir well.
Trim fat from lamb chops. Combine mustard and vinegar; brush mustard mixture evenly over chops. Dredge chops in breadcrumb mixture.
Coat a large nonstick skillet with cooking spray; place over medium heat until hot. Add chops; cover and cook 4 minutes on each side or until browned. Uncover and cook 5 minutes on each side or to desired degree of doneness. Transfer chops to a serving platter, and sprinkle evenly with grapes.