French Silk Pie

Cream butter (20 mins). Add sugar, cream 20 mins more. Add eggs, one at a time, beating 5 minutes after each addition. Add melted chocolate, beat 5 minutes. Add vanilla, beat 5 mins. pour into baked pie shell. chill overnite for filling to firm and flavours to mellow. top, if desired, with unsweetened whipped cream and chocolate curls.