Mix crushed Oreos with melted butter thoroughly.
Press mixture into pan bottom firmly.
Refrigerate crust for 15 minutes completely.
Beat cream cheese until smooth and fluffy.
Add sugar and mix well together.
Add eggs one at a time slowly.
Mix in vanilla, cocoa, and coloring.
Fold in chopped Oreos gently now.
Pour filling over prepared crust carefully.
Bake at 325°F for 55 minutes.
Center should jiggle slightly when done.
Cool completely before removing from pan.
Refrigerate for 4 hours minimum time.