Line a baking sheet with parchment paper or a silicone baking mat.

In a heatproof bowl, melt the white chocolate chips or chopped white chocolate using a double boiler or in short intervals in the microwave, stirring between each interval until smooth.

In a large mixing bowl, combine chow mein noodles, salted peanuts or mixed nuts, and mini marshmallows.

Pour the melted white chocolate over the mixture, gently folding and stirring until all ingredients are well coated.

Using a spoon or cookie scoop, drop mounds of the mixture onto the prepared baking sheet, forming haystack shapes.

Allow the white chocolate haystacks to set at room temperature or refrigerate for quicker setting.

Once set, store the haystacks in an airtight container at room temperature.

Serve and enjoy these delightful White Chocolate Haystacks, savoring the sweet and crunchy combination of white chocolate, chow mein noodles, nuts, and marshmallows.