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Combine 1/3 cup sugar and cornstarch in a heavy saucepan.
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Stir until well blended, slowly adding milk; bring to a boil.
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Cook, stirring constantly, 1 minute or until thickened.
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Remove from heat and stir in the peanut butter and vanilla extract.
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Combine the egg whites (room temperature) and salt, beating until foamy.
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Gradually add 2 tablespoons sugar, beating until stiff but not dry (but don't over beat).
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Fold the egg whites into the peanut butter mixture.
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Spoon into serving dish/glasses.
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Cover and let chill, adding Cool Whip; sprinkle the nuts before serving.