Arrange broccoli in a steamer basket over boiling water. Cover and steam 10 minutes or just until tender. Remove from heat. Transfer broccoli to a lightly greased 2-quart gratin or other shallow baking dish.
Meanwhile, melt butter in a heavy saucepan over medium heat; add flour, stirring until smooth. Cook 1 minute, stirring constantly. Gradually add milk, stirring constantly. Cook, stirring constantly, until sauce is thickened and bubbly. Remove from heat; stir in mustard and next 3 ingredients. Pour sauce over broccoli; sprinkle with cheese. Broil 5 1/2" from heat 6 to 8 minutes or until lightly browned. Serve hot.
This was fabulous! I used frozen broccoli, skim milk, and pepper jack cheese (instead of GruyÃ¨re). I served it to vegetable-hating guests and watched the entire casserole disappear. Bummer I didn't get any leftovers. So quick, cheap, tasty, and easy - will definitely make it again in quantity.
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