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Combine the Hershey bars, marshmallow creme, and milk in the top of a double boiler set over barely simmering water.* Stir until melted. Remove from the heat and let cool to room temperature.
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While the chocolate mixture is cooling, place a medium bowl and the beaters of an electric mixer in the fridge.
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Once mixture is cool, remove the bowl and mixers from the refrigerator and beat the heavy cream until it holds stiff peaks.
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Gently fold a few tablespoons of the chocolate mixture into the whipped cream to lighten. Fold in the remaining chocolate to combine, then pour into the chilled crust.
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Refrigerate overnight; leave in the fridge until just before serving.
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After pie has chilled, slice and serve with whipped cream (if desired). If your pie is too soft to cut nicely, pop it in the freezer for a few minutes to firm up.