Mix peanuts and candy corn in small bowl. Spread on the bottom of a pan. In a small saucepan, melt and stir peanut butter chips and butter over low heat. After it is melted, add sweet condensed milk.
Put marshmallows in a bowl. Add melted peanut butter mixture and mix until marshmallows are coated. Spread over the top of the peanut and candy corn in pan. Press into marshmallows. Refrigerate to slice easier.