1. Stir together first 8 ingredients in a medium bowl. Stir in tuna. Cover and chill 1 hour.
2. Divide mixture among phyllo shells (about 1 Tbsp. each), and place on a 15- x 10-inch jelly-roll pan. Top with cheese pieces.
3. Preheat broiler with oven rack 5 1/2 inches from heat. Broil tartlets 1 to 2 minutes or until cheese is melted. Serve immediately. Garnish, if desired.
*Gala apple may be substituted.