Make the pie pastry. Roll it out and line a 10-inch pie plate. Trim and flute the edges.
Preheat the oven to 350°F. Combine all the ingredients except the egg whites and sweetened whipped cream. Mix thoroughly.
Beat the egg whites until stiff but not dry. Fold them into the pie mixture. Pour the mixture into the pie shell and bake until a toothpick inserted in the center comes out clean, about 50 minutes. Cool, Serve with sweetened whipped cream.