1 (12 oz.) pkg. peanut butter flavored chips
1/4 c. butter
1 (14 oz.) can Eagle Brand milk
1/2 c. chopped peanuts, optional
1 (6 oz.) pkg. semi-sweet chocolate chips

In heavy saucepan melt peanut butter chips and 2 tablespoons butter with 1 cup sweetened condensed milk. Remove from heat, stir in peanuts if desired. Spread into wax paper-lined 8 inch square pan.

In heavy saucepan melt chocolate chips and remaining 2 tablespoons butter with remaining sweetened condensed milk. Spread chocolate mixture on top of peanut butter mixture. Chill 2 hours or until firm. Cut into squares and store loosely covered at room temperature.