Line a large baking sheet with parchment or waxed paper.
In a large microwave-safe bowl, add the butterscotch chips, chocolate chips, and peanut butter. Microwave initially for 30 seconds. Stir. Continue microwaving in 20-second intervals, stirring between each, until mixture is smooth and fully combined, about 3 minutes total. Do not overheat.
Stir in the steam-fried dried chow mein noodles and the crushed peanuts until well coated.
Using a large ice cream or cookie scoop, quickly scoop roughly a ¼ cup of the mixture onto the lined baking sheet.
Let cool until hardened, about 2 hours. Remove from the waxed paper and store in an airtight container for up to 2 weeks.
Notes
These are large haystack cookies; you can make them smaller and get 18-24 haystack cookies if desired.The peanuts are optional, but they are a delicious addition!