Preheat the Oven To 325°F. In A Large Bowl, Whisk Together the Cocoa Powder, Sugar, And Corn Starch. Add in The Beaten Egg, Melted Butter, Milk, And Vanilla. Stir Well to Combine.
- Spread the Peanut Butter evenly onto unbaked Pie Shell. Pour the mixture into the Pie Shell being cautious not to over-fill.
- Bake For 45 To 55 Minutes or until a crust has formed completely across the top of the Pie and is mostly set. There will still be some jiggle to the Pie.
- Allow to cool completely before slicing and serving. This will allow it to set even more.
- Serve with a dollop of Whipped Cream, if desired.