In bowl, combine eggs, sugar and salt. Add sour cream and blend well. Add cream cheese to egg mixture; beat until smooth. Gradually blend in chocolate mixture. Pour into prepared crust and bake for 35 minutes or until filling is barely set in center.
5 Turn off heat and let stand in oven for 15 minutes with door open, then take out of oven and let stand at room temperature for 1 hour. Refrigerate several hours or overnight. Garnish with whipped cream and chocolate shavings, if desired.