Parmesan Squares
["6 to 8 bread slices (not fresh)", "1/2 c. mayonnaise", "1 medium onion, finely chopped", "Parmesan cheese"]
["Remove crust and cut bread slices into four pieces each.", "Mix mayonnaise with chopped onion and spread on bread squares.", "Place on baking sheet.", "Sprinkle with Parmesan cheese.", "Broil until golden brown.", "Watch carefully so as not to burn.", "Serve immediately."]
["bread", "mayonnaise", "onion", "Parmesan cheese"]