Beat egg whites and salt until soft peaks form. Gradually add sugar, beating until stiff peaks form. Fold in crumbs, nuts and vanilla. Spread evenly in lightly buttered 9-inch pie plate. Bake in slow oven, 325 degrees for 35 minutes. Cool thoroughly. Spread top with sweetened whipped cream. Chill 3 to 4 hours. Trim with curls of shaved chocolate.