Directions
In mixer bowl, cream butter, gradually add sugar, creaming till light.
Blend in chocolate and vanilla.
Add eggs, one at a time, beating 3 minutes after each addition, on medium speed of electric mixer.
Turn into pie shell.
Chill several hours.
Pie shell: Use oreo cookies with cream centers scraped off (or chocolate wafer cookies, but I like oreos the best.)
Combine cups crushed cookie crumbs with melted butter.
Press into 8-inch or 9-inch pie plate (I use a glass one).
Bake at 375 F for 10 minutes and then let cool completely before filling (I often make the shell one day and the filling the next - just cover shell with plastic wrap after it has cooled to keep it fresh till you fill it.)