In a bowl, beat eggs. Add sugar, butter and vanilla. Combine the flour, cocoa and salt; add to bowl and beat until well blended. Stir in chocolate chips and nuts. Spread into a greased 9-in. pie plate. Bake at 350° (325° if using a glass pie plate) for 30-35 minutes or until set. Cool completely before cutting. If desired, top individual slices with ice cream and drizzle with chocolate syrup.