Heat oven to 350 degrees. Grease an 8-inch pie plate. In small mixer bowl, beat eggs, blend in sugar and butter. In separate bowl, stir together, flour, cocoa and salt. Add to egg mixture, beating until blended. Stir in chocolate chips, nuts and vanilla. Spread batter into prepared pie plate. Bakke for 35 minutes until set. (Pie will not test done in the center.) Cool completely. Cut into wedges. Serve with ice cream and/or commercial chocolate sauce.