Place cooked broccoli spears in a lightly buttered, shallow 1 1/2 quart baking dish. In a saucepan over medium low heat, melt butter; stir in flour, salt and pepper. Gradually add milk, stirring constantly until sauce mixture is smooth and thickened. Remove from heat; stir in sherry, if using. Top broccoli with the salmon chunks. Pour sauce over salmon. Combine Parmesan cheese and bread crumbs; sprinkle over sauce. Bake salmon casserole at 425° for 20 to 25 minutes, or until topping is golden brown and salmon casserole mixture is bubbly.
Salmon casserole recipe serves 4 to 6.