In large bowl, stir cookie mix, butter, cream cheese and egg with spoon until dough forms. Divide dough in half. Add cocoa and food color to 1 half; mix until well blended and uniform in color. Place red dough between 2 (17x12-inch) sheets of waxed paper; roll out to 12x7-inch rectangle. Repeat with plain dough; remove top sheet of waxed paper from both doughs. Invert plain dough onto red dough. Gently press out layered dough and trim edges. Remove top sheet of waxed paper from plain dough. Starting with short side, roll up dough in bottom sheet of waxed paper. Wrap tightly; freeze 2 hours or until very firm.