1Heat oven to 325ºF. Grease bottom and side of round pan, 8x1 1/2 inches, or pie plate, 9x1 1/4 inches. Stir together granulated sugar, butter, flour, cocoa, vanilla, salt and eggs in medium bowl. Stir in nuts. Pour into pan.
2Bake 25 to 30 minutes or until edge appears dry and toothpick inserted halfway between center and edge comes out clean (center will be moist). Immediately prick holes in pie with toothpick. Spread 1/4 cup fudge sauce over top. Cool completely,about 1 hour.
3Beat whipping cream and powdered sugar in chilled medium bowl with electric mixer on high speed until stiff. Spread over fudge sauce. Drizzle with 2 to 3 tablespoons fudge sauce. Garnish with additional nuts. Cover and refrigerate any remaining pie.