1 (12 oz.) pkg. peanut butter chips
1 (14 oz.) can sweetened condensed milk (not evaporated)
1/4 c. butter
1/2 c. chopped peanuts (optional)
1 (6 oz.) pkg. semi-sweet chocolate morsels

In large saucepan, melt peanut butter chips, 1 cup sweetened condensed milk and 2 tablespoons butter; stir occasionally. Remove from heat. Stir in peanuts. Spread mixture into wax paper lined 8 inch square pan.

In small saucepan melt chocolate morsels, remaining sweetened condensed milk and butter. Spread mixture on top of peanut butter mixture. Chill 2 hours or until firm. Turn fudge onto cutting board, peel off paper. Cut into squares.