Heat oven to 350 degrees F. Coat 15 x 10-inch baking pan with no-stick cooking spray.
Prepare brownie mix according to package directions using oil, water and eggs. Spread evenly in prepared pan. Bake 17 to 20 minutes or until set in center. Cool 15 minutes. Freeze 30 minutes to make cutting easier.
Microwave chocolate chips in medium microwave-safe bowl on high 45 seconds or until melted and smooth when stirred. Stir in sweetened condensed milk, hazelnut spread, salt and almond extract until smooth.
Trim edges of brownies. Cut into 70 (1 1/4-inch) squares. Arrange on serving platter. Place chocolate hazelnut mixture in decorating bag fitted with medium star tip. Pipe swirls on top of each brownie. Garnish each with 1 piece of chopped hazelnut, if desired.