Instructions: In a small bowl, stir together onions, Parmesan, and 6 tablespoons of the mayonnaise until well blended. If needed, add remaining mayonnaise to give mixture a firm spreading consistency. Place bread in a single layer on a baking sheet; broil 4 to 6 inches below heat until golden brown. Turn slices over and spread with cheese mixture. Return to oven and broil until bubbly and lightly browned, about 3 minutes.

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