Heat oven to 350°F. Grease bottom only of 13x9-inch pan with shortening or cooking spray. In medium bowl, stir brownie mix, water, oil, espresso powder and eggs until well blended. Stir in hazelnuts; spread in pan. Bake 24 to 26 minutes or until toothpick inserted 2 inches from side of pan comes out clean or almost clean. Cool completely, about 40 minutes.