- 1/2 cup mayonnaise
- 1/4 cup freshly grated Parmesan
- 2-ounces canned mushroom pieces and stems, drained
- 1/2 of a 2.8-ounce can french-fried onion rings
- 1 loaf (8-ounce) party rye or pumpernickel bread
In a bowl, stir together the mayonnaise, Parmesan, mushrooms, and onion rings. Spread on lightly toasted party rye or pumpernickel. Place the canapes on a baking sheet and broil until the topping is bubbly.