In large bowl, mix 1/2 cup sugar, the cinnamon, ginger, nutmeg, salt, pumpkin, evaporated milk and egg. Carefully pour pumpkin mixture over cream cheese mixture. Bake at 350°F. 15 minutes. Cover crust edge with strips of foil to prevent excessive browning; bake 30 to 40 minutes longer or until knife inserted in centre comes out clean. Cool completely; about 1 1/2 hours. Refrigerate about 2 hours or until serving time. Garnish each serving with dollop of whipped cream. Cover and refrigerate any remaining pie.