This recipe came from and ad- maybe condensed milk? My son-in-law loves this, so I've been making it for 6-7 years, I think

Melt chips with 1 cup condensed, add vanilla. Spread half the mix in 9" wax paper lined pan. Chill 10 minutes. Now melt white coating with remaining condensed milk. Add peppermint extract. Pour over bottom layer. Chill 10 minutes. Add remaining mix. Chill until firm and cut.