Line 8 or 9-inch square pan with waxed paper.
In heavy saucepan over low heat, melt chocolate chips with 1 c. of the SCM. Stir in vanilla. Spread half the mixture in prepared pan; chill 10 minutes or until firm . Keep remaining chocolate mixture at room temperature.
In heavy saucepan over low heat, melt white chips with remaining SCM. Stir in peppermint extract and food coloring of your choice. Spread over chilled chocolate layer; chill 10 minutes or until firm. Spread reserved chocolate mixture over mint layer. Chill 2 hours or until firm. ( sometimes I sprinkle chopped peppermint candy canes on top, before refrigerating.)
Turn candy onto cutting board, peel off paper and cut into squares. Store loosely covered at room temperature.