01 -
In a large saucepan over low heat, combine the peanut butter and butterscotch chips. Stir constantly until the mixture is smooth and fully melted. Remove from heat.
02 -
Stir in the vanilla extract to enhance the flavor.
03 -
Gently fold in the chow mein noodles, and optionally mini marshmallows or peanuts, until they are fully coated in the peanut butter mixture. Use a spatula to avoid crushing the noodles.
04 -
Drop spoonfuls of the mixture onto a baking sheet lined with parchment or wax paper. Shape them into haystack-style mounds using two spoons.
05 -
Allow the haystacks to cool at room temperature for about 30 minutes, or refrigerate for 15–20 minutes until firm.
06 -
Serve immediately or store in an airtight container at room temperature for up to 5 days.