Preheat oven to 325°F. Place paper baking cups in each of 18 regular-size muffin cups.
In a small bowl, mix crushed cookies and melted butter until well combined. Divide the mixture evenly among muffin cups and press down firmly.
In a large bowl, beat cream cheese with electric mixer on medium speed until smooth. Add sugar, cocoa, vanilla, and food color; mix until blended.
Add eggs, one at a time, beating well after each addition. Stir in sour cream just until blended.
Spoon the cheesecake mixture evenly into the muffin cups over the crusts.
Bake 20 to 25 minutes or until centers are set. Cool completely in pan, about 1 hour.
Refrigerate at least 2 hours or until chilled. Top with whipped cream before serving, if desired.