HEAT oven to 350 degrees F. Combine cake mix, 1 egg, butter and 2 teaspoons pumpkin pie spice in large bowl until mixture resembles coarse crumbs. Press into bottom of 15 x 10-inch jellyroll pan.
BEAT cream cheese in large bowl until fluffy. Gradually beat in sweetened condensed milk; beat in 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.