Microwave Double Fudge
["1 bag chocolate chips", "1 bag peanut butter chips", "1 can sweetened condensed milk", "walnuts (optional)"]
["Melt chocolate chips in microwave until smooth.", "Stir in 1/2 can milk.", "Pour in 9 x 9-inch square pan.", "Melt peanut butter chips until smooth.", "Stir in 1/2 can milk.", "Put a layer of walnuts on top of chocolate, then pour melted peanut butter over top and spread out.", "Chill for 2 hours, then cut into squares and eat."]
["chocolate chips", "peanut butter", "condensed milk", "walnuts"]