Position a rack in the middle of the oven. If you are not using a glass pie dish, set a metal baking sheet on the rack. Preheat the oven to 350ยบ F.
Spread the chocolate evenly over the bottom of the prepared pie shell.
In a large bowl whisk the eggs. Whisk in the brown sugar, corn syrup, bourbon, butter, vanilla and salt. Stir in the pecans, almonds and walnuts. Pour the filling into the pie shell.
Bake the pie until the top is browned and the filling is uniformly but not firmly set, about 50 minutes.
Remove from the oven and cool on a rack to room temperature before cutting. Serve the pie with a dollop of whipped cream.