Chocolate Silk Pie

1/2 cup butter (no substitute)
3/4 cup confectioners' sugar, sifted
2 (1 ounce) squares cooking chocolate, melted
1 teaspoon vanilla extract
2 eggs, cold
1 (9-inch) pie shell, baked
1 cup heavy cream, whipped

Cream butter. Add sugar. Beat until light and smooth.

Add melted chocolate and vanilla extract. Beat until smooth.

Add eggs one at a time; beat 5 minutes after each addition.

Pour into baked pie shell. Chill in refrigerator until set.

Top with whipped cream.