Peanut Butter Marshmallow Squares

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1 (11 ounce) package butterscotch chips

1 cup peanut butter

0.5 cup butter

3.5 cups miniature marshmallows

1 cup flaked coconut

1 cup chopped walnuts

Grease a 9x13-inch pan; set aside.
Place butterscotch chips, peanut butter, and butter in the top of a double boiler over simmering water. Stir frequently, scraping down the sides with a rubber spatula to avoid scorching, until melted and combined, about 5 minutes. Remove from heat.
Stir marshmallows, coconut, and walnuts into butterscotch mixture until evenly combined.
Pour mixture into prepared pan. Refrigerate until set, about 1 hour. Cut into 18 squares and store in the refrigerator.