In a microwave, melt the chocolate and butter; stir until smooth. Cool slightly. In a large bowl, beat the eggs, corn syrup and sugar until smooth; stir in vanilla and chocolate mixture.
Pour into pastry shell. Sprinkle with nuts. Bake at 350° for 45-50 minutes or until top begins to crack and crust is golden brown. Cool. Serve with ice cream or whipped cream if desired. Store in the refrigerator.
The filling for this pie doesn't require flour. If you'd like to make it gluten-free simply bake it without the pastry shell