Preheat oven to 350°.
Trim fat from pork; place on a broiler pan coated with cooking spray.
Combine mustard and next 4 ingredients (mustard through pepper) in a bowl; brush over pork. Insert meat thermometer into the thickest part of pork.
Bake at 350° for 50 minutes or until thermometer registers 160° (slightly pink), basting frequently with mustard mixture. Garnish with thyme, if desired.