Chocolate Mint Fudge

2 cups semi-sweet chocolate chips
1 (14 oz) can sweetened condensed milk
2 teaspoons vanilla extract
1 cup white confectioners' coating
1 tablespoon peppermint extract
1 drop green food colouring (optional)

In heavy saucepan over low heat, melt chocolate chips with 1 cup sweetened condensed milk and vanilla. Spread half of the mixture into a wax paper-lined 8 or 9" square pan; chill 10 minutes or until firm. Reserve remaining chocolate mixture at room temperature.

In another heavy saucepan over low heat, melt white confectioners' pieces with remaining sweetened condensed milk (mixture will be thick). Stir in peppermint extract and food colouring (if desired). Spread this mixture on chilled chocolate layer; chill 10 minutes longer or until firm. Spread reserved chocolate mixture over the mint layer. Chill 2 hours or until firm.