Parmesan Cheese Rounds

1. 1

   Preheat the broiler to 425 degrees F.

2. 2

   With a 2 1/8-inch cookie cutter, cut 2 rounds out of each slice of bread.

3. 3

   Arrange the rounds on a baking sheet and place 5 inches from the heat source.

4. 4

   Toast the bread on one side until they are golden brown, 3 to 5 minutes.

5. 5

   Using a whisk, mix together the mayonnaise and Parmesan in a small bowl.

6. 6

   Remove the bread from the oven and turn the rounds over to the untoasted sides.

7. 7

   Spread each with a thin layer of mustard.

8. 8

   Put 1 onion slice on top and cover with about 1 teaspoon of the mayonnaise mixture, spreading the mixture across the onion and bread.

9. 9

   Broil until golden, about 1 minute.

10. 10

    Never take your eyes off these; the time varies with different ovens.

11. 11

    Work in batches of 24 rounds.

12. 12

    Serve one batch hot while the next is cooking.

* Per serving · 4 servings · Values may vary.