Cream together 1/3 c butter & 3/4 c sugar. Cream well. Blend in- 1 sq (1 oz) chocolate melted & cooled. Add- 1 tsp vanilla, 2 eggs (one at a time, beating 5 minutes after each addition (with electric mixer). Turn into baked pie shell & chillI -2 hours. Then top with whipped cream & nuts.
Got from my high school cooking class. Very rich & good.