Instructions: Stir together sugar, flour, and salt in medium saucepan; gradually stir in milk. Bring to a boil over medium heat, stirring constantly.

Reduce heat to medium-low and cook for an additional 2 minutes, stirring constantly. Add chocolate and marshmallows; cook until melted.

Remove pan from heat. Stir in butter and vanilla; cool. Pour filling into pastry shell. Refrigerate until ready to serve. Top with whipped cream, if desired.

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