Preheat oven to 350 degrees F. In large bowl, on low speed, combine cake mix, 1 egg, butter and 2 teaspoons pumpkin pie spice until crumbly. Press onto bottom of 15x10-inch jellyroll pan.
In large mixing bowl, beat cream cheese on low until fluffy. Gradually beat in sweetened condensed milk, then remaining 2 eggs, pumpkin, remaining 2 teaspoons pumpkin pie spice, and salt; mix well.
Pour over crust; sprinkle with nuts.
Bake 30 to 35 minutes or until set. Cool. Chill; cut into bars. Store covered in refrigerator.
