In A Bowl, Combine The Butter, Mustard, Onion, Garlic, Thyme And Pepper Flakes. Dip Chicken In Butter Mixture, Then Coat With Bread Crumbs. Place In A Greased 11-In. X 7-In. X 2-In. Baking Dish. Bake, Uncovered, At 350 Degrees F For 30-35 Minutes Or Until Chicken Juices Run Clear.