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In microwave, melt the chocolate squares and the Hershey bar and set aside to cool.
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In a medium bowl, cream the butter, gradually add in the sugar and cream together well.
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Mix in the melted, cooled chocolate and vanilla.
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Add the eggs 1 at a time, beating 5 minutes each, and scraping the sides of the bowl often to incorporate all the sugar. (Beat until there's no longer any grains of sugar).
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Spoon and smooth into pie crust. Chill until set, about 1 hour.
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Serve topped with Cool Whip, chocolate shavings and a maraschino cherry.