Crust: Mix crust ingredients well and press into 9-inch pie pan.
Bake at 300° for 15 minutes. Let cool.
Filling: Cream butter and sugar. Put in chocolate and vanilla.
Add one egg at a time and beat each egg 4 minutes at medium speed. (Beating each egg for 4 minutes makes the pie light and fluffy - an important step)
Pour into cooled pie crust. Chill for 24 hours. (Brings out the flavors)