Mix together the butter, garlic powder, Dijon, and Worcestershire in a dish. (I typically use old pie pans for this.)
Mix the bread crumbs, Parmesan, and parsley together in another.
Dip the chicken in the butter, then in the bread crumbs, then place in a buttered or greased 9x9 or so pan. Bake at 350 for 50-60 minutes, until done through.