Preheat oven to 350°F. Spray two 6 x 3 in. round baking pans with vegetable pan spray. In large bowl, combine cake mix, coffee, oil and egg whites with electric mixer on low speed until moistened; beat at medium speed 2 minutes. Add hazelnuts and blend. Pour into prepared pans. Bake 40-45 minutes or until toothpick inserted in center comes out clean. Cool in pan on wire rack 10 minutes. Remove from pan to cooling grid; cool completely.