Marshmallow Peanut Butter Squares 1 cup creamy peanut butter 1/2 cup butter 2 (6 ounce) packages butterscotch chips 1 large package miniature colored marshmallows Put the peanut butter, butter and butterscotch chips in a heavy-bottomed saucepan and cook over low heat until melted and well combined. Let cool. Add marshmallows, and put into a buttered 8-inch square pan. Store in refrigerator.