Heat oven to 350 degrees. Grease a 13 x 9 inch pan. In large bowl, combine cake mix and margarine at low speed until crumbly. Reserve 1/2 cup crumbs for topping. Press remaining crumbs in bottom of prepared pan. In same large bowl, beat ground almonds, powdered sugar, almond extract and egg whites on highest speed for 4 minutes. Pour evenly over crumbs. Combine 1/2 cup reserved crumbs and chopped almonds; sprinkle over egg white mixture. Bake for 20 to 30 minutes or until light golden brown. Cool. Cut into bars.