Hi, Trudy. The middle two paragraphs explain how to make the sauce:
Let the water in which the beans cooked reduce to a few tablespoons. Add the butter and let it melt. Add the flour and cook, stirring constantly, until thickened.
Cover the beans with a layer of onions, then pour the sauce over the onions. Pour the cream over the sauce and add Swiss cheese. Stir to combine.
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