3 c. peanut butter chips
1 (4 oz.) can sweetened condensed milk
1/4 c. butter
1 c. chopped walnuts or pecans

Place all ingredients, except nuts, in a bowl. Microwave at medium (50%) until peanut butter chips are melted 3 to 5 minutes, stirring once or twice during cooking. Stir in nuts. Pour into well-greased square baking dish, 8x8 inches. Refrigerate until set. Makes about 2 pounds.