Preheat oven to 350 degrees F (175 degrees C).
Place broccoli in a large saucepan with enough water to cover.Heat over medium-high heat until water begins to boil; remove from heat and drain.
In a large bowl combine broccoli, soup, onion, sour cream and flour.Mix well and transfer to a 2 quart casserole dish.In a small bowl combine stuffing mix and butter; spread over broccoli mixture.
Bake in preheated oven for 30 minutes.Let stand for 5 minutes before cutting.
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