Peanut Butter Cream Cheese Pie

20 Oreo cookies, crushed
1/4 cup butter
3 ounces cream cheese, softened
1/3 cup peanut butter
1 cup powdered sugar
1/2 cup milk
3/4 cup cool whip 

Mix crushed cookies with butter and press into pie plate. 
Bake at 400ºF for 5 minutes, then cool. 
Combine cream cheese, peanut butter, sugar and milk, stirring until smooth. 
Pour into prepared crust and refrigerate. 

Immediately before serving, top with cool whip.