In A Bowl, Combine Mustard And Onion. In Another Bowl, Combine Bread Crumbs And Parsley. Toss Chicken In Mustard Mixture, Then Coat Evenly With Crumb Mixture. Line A Baking Sheet With Foil; Coat The Foil With Nonstick Cooking Spray. Thread Chicken Onto Metal Or Soaked Wooden Skewers, Leaving A Small Space Between Chunks. Place On The Prepared Baking Sheet. Bake, Uncovered, At 450 Degrees F For 6-8 Minutes Or Until Juices Run Clear.