Preheat oven to 400°. Place salmon on a baking sheet coated with cooking spray. Mix mustard and honey; brush over salmon. Place bread in a food processor; pulse until coarse crumbs form. Transfer to a small bowl. Stir in walnuts, oil and thyme; press onto salmon.
Bake 12-15 minutes or until topping is lightly browned and fish just begins to flake easily with a fork.
