Chocolate Butterscotch Fudge
1 cup butterscotch chips
1 (14 ounce) can sweetened condensed milk (not evaporated milk), divided
2 cups (12 ounce package) semi-sweet chocolate chips
1 teaspoon vanilla extract
1/2 cup chopped walnuts
Line a 8" x 8" square baking pan with aluminum foil, extending foil at least 2" over edges of pan. Place butterscotch chips and 1/3 cup sweetened condensed milk in small microwave-safe bowl. Set aside.
Place chocolate chips, remaining sweetened condensed milk and vanilla in medium microwave-safe bowl. Microwave on high (100%) 1 minute. Stir until chips are melted. Stir in walnuts. Spread evenly into prepared pan.
Microwave butterscotch chip mixture on high 45 seconds. Stir until chips are melted. Spread evenly over chocolate layer. Refrigerate until firm.
Using the extended edges, lift fudge from pan. Place on cutting board. Peel off foil. Cut into squares.
For best results, do not double recipe.
Store tightly covered in refrigerator.
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