grated parmesan cheese
crust removed (or use wheat bread)
paper thin slices Vidalia or other sweet onion
Preheat the broiler.
In a small bowl, mix together the grated parmesan cheese and mayonnaise. Spread evenly on the bread slices. Cut each into 4 equal squares. Place an onion slice on each square.
Broil 4-5 inches from the heat source until browned, about 2 minutes. Serve immediately.