"Fans of French onion soup will gobble up this comforting casserole. The 30-minute side dish would be a nice accompaniment to beef entrees.—Margaret McClatchey, Loveland, Colorado..."
INGREDIENTS
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8 medium onions, sliced
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5 tablespoons butter, divided
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2 tablespoons all-purpose flour
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Dash pepper
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3/4 cup beef broth
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1/4 cup sherry or additional beef broth
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1-1/2 cups salad croutons
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1/2 cup shredded Swiss cheese
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3 tablespoons grated Parmesan cheese