Heat condensed milk, chocolate chips and evaporated milk in a large saucepan on low heat for about 12 minutes, stirring often, until chocolate chips are melted. Reserve 1/2 cup (125ml) chocolate mixture.

Add remaining 4 ingredients. Mix well. Press firmly into greased foil-lined 9x9 inch (22x22 cm) pan. Spread reserved chocolate mixture over wafer crumb mixture. Cut into 36 squares.