1. Preheat oven to 350 degrees. Stir together brown sugar, cocoa and salt. Add corn syrup, eggs, butter and vanilla; stir until well blended. Stir in pecans, walnuts and almonds. Pour into unbaked pie crust. To prevent over browning of crust, cover edge of pie with foil.
2. Bake 30 minutes. Remove foil. Bake additional 25 to 30 minutes or until puffed across top. Remove from oven to wire rack. Cool completely.
3. Garnish with whipped topping and additional nuts, if desired. Cover; store leftover pie in refrigerator.