Active time: 45 min Start to finish: 45 min

　　

Ingredients

Makes 16 finger sandwiches

　　6 oz finely grated extra-sharp Cheddar (1 1/2 cups)

　　1/2 cup mayonnaise

　　6 tablespoons finely chopped sweet onion

　　32 thin slices firm white sandwich bread

　　3/4 stick (6 tablespoons) unsalted butter, softened

　　2 bunches fresh chives, very thinly sliced (3/4 cup)

　　Special equipment: a 2-inch round cookie cutter

　　

Step 1

Stir together Cheddar, mayonnaise, onion, and salt and pepper to taste.

　　

Step 2

Cut out a round from each bread slice with cookie cutter. Arrange 8 bread rounds on a work surface and divide half of Cheddar mayonnaise among them, spreading evenly to edges. Top each with a plain round. Cover sandwiches with plastic wrap and make more in same manner.

　　

Step 3

Spread a thin layer of butter around cut edges of rounds and roll in chives, pressing with your fingertips.

　　Cooks' note:

　　• Sandwiches may be made 6 hours ahead and chilled, covered with dampened paper towels and plastic wrap.