Cindy's Chocolate Silk Pie

1 square (1 ounce) unsweetened chocolate

1 cube butter

3/4 cup sugar

1 teaspoon vanilla

2 eggs

1 baked pie crust

Melt chocolate in a double boiler or the microwave. Cream butter and sugar. Add chocolate and vanilla. Beat for 5 minutes after addition of each egg. Pour into 9 inch baked pie crust and refrigerate. Serve with whipped cream. Easy to double for a 10 inch pie, add eggs 2 at a time.