Show up to the family reunion with a crowd stopper. Gain new skills in the kitchen with Hershey Kitchens Chocolate Mint Nanaimo Bars Recipe.
Melt 1 cup (250 mL) chocolate chips with butter in saucepan set over low heat. Stir in graham wafer crumbs, coconut and walnuts. Press evenly into 9-inch (23 cm) square baking pan. Chill for 30 minutes.
To melt chocolate chips, microwave 1 cup (250 mL) of chocolate chips in microwavable bowl on Medium, checking every 15 seconds, for about 2 minutes or until melted. Stir until smooth.
Blend icing sugar with butter, milk, custard powder, mint extract and several drops of green food colouring. Spread evenly over chilled base.
Melt remaining chocolate chips with vegetable oil in heatproof bowl set over larger saucepan of simmering water. Spread evenly over filling. Chill until completely set.