Step 1

Preheat the oven to 325°F.

Step 2

In a large mixing bowl, combine the butter, sugar, cocoa powder, eggs, evaporated milk, and vanilla with a large wooden spoon or a hand-held mixer until thoroughly combined. Pour the mixture into the pie crust and spread it evenly, all the way to the edges.

Step 3

Bake for 45 minutes.

Step 4

Remove the pie from the oven and allow it to cool on a cooling rack until completely cool.

Step 5

Serve at room temperature with a dollop of whipped cream, if desired.