3 c. semi-sweet chocolate chips
1 can (14 oz.) sweetened condensed milk
1/4 c. butter
1 c. chopped walnuts

Place chips, milk and butter in a bowl and microwave at medium until chips are melted; 3 to 5 minutes, stirring once or twice. Stir in nuts. Pour into a well-greased 8 inch square pan. Refrigerate until set.

Variation: Substitute 1 cup peanut butter chips for 1 cup of the chocolate chips.