Preheat oven at 350. Separate egg yolks from whites. Set yolks aside. Beat whites with mixer til stiff peaks form. Put this bowl in refrigerator. In lg bowl beat yolks; stir in cream, potatoes, sugar, vanilla & salt. Beat til smooth. Pour into both pie shells; sprinkle with cinnamon & nutmeg.
Wrap edges of pie with aluminum foil, covering the rim. Place on center rack of oven & baje for 25 mins. Remove pies from oven, remove foil then put back into the oven for another 15-20 mins or until crust is done. Allow to cool before serving.