In large mixer bowl, beat the cheese until fluffy. Gradually beat in the sweetened condensed milk; then the remaining 2 eggs, the pumpkin and the remaining 2 teaspoons pumpkin pie spice and salt; mix well.
Pour over the crust and sprinkle with chopped nuts. Bake for 30-35 minutes, or until set.
Cool. Chill, then into bars. Store in the refrigerator.