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Spread one side of bread with butter. Place buttered side down in 13 x 9 inch baking dish. Saute onions and mushroooms in butter; spoon over bread. In a plastic bag, dust cheese with flour; spread evenly over mushrooms and onions. Beat eggs with mustard and milk and pour over mixture. Cover and refrigerate 4 hours or overnight. Bake uncovered at 350 degrees F. for 45 minutes.
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