Heat oven to 375°F. Place pastry sheet on lightly floured surface. Cut 12 (2-inch) rounds from pastry; place on ungreased cookie sheet. Bake at 375°F. for 20 to 25 minutes or until puffed and golden brown.
Remove warm pastry rounds from cookie sheet; place on wire rack. While still warm, split each round into 2 layers to form 24 rounds. Cool completely.
Meanwhile, in small bowl, combine turkey, onions, mayonnaise, 2 tablespoons cranberry sauce, ginger and dry mustard; mix well. Refrigerate until serving time.
To serve, spoon about 1 teaspoon turkey mixture on split side of each round. Garnish appetizers with small dots of cranberry sauce.