1 (12 oz.) chocolate chips
1 (14 oz.) can sweetened condensed milk
1 1/4 c. walnuts
1 tsp. vanilla

Combine over hot water (not boiling) chocolate chips and sweetened condensed milk, stir until chips melt and mixture is smooth. Stir in walnuts and vanilla. Spread into foil-lined 8 inch square pan. Chill.