Mix cookie crumbs and butter; press onto the bottom of a 9x13-inch pan sprayed with cooking spray.
Melt 4 chocolate squares as directed on package; place in a medium bowl. Set aside.
Beat cream cheese, sugar and vanilla with mixer until well blended. Add eggs; beat just until blended. Remove 2 cups batter; mix with melted chocolate and food coloring. Carefully spread over crust; cover with remaining plain batter.
Bake 26 to 28 minutes, or until center is almost set. Cool completely. Melt remaining chocolate squares; drizzle over dessert. Refrigerate for 4 hours.