Put the butterscotch chips and peanut butter in a large microwave-safe bowl. Microwave for 1 minute, then remove and stir. Continue to microwave in 30-second bursts, stirring after each time, until melted. Stir until completely smooth.
Pour the chow mein noodles into the melted coating and stir well to coat. Make sure to stir up from the bottom to evenly coat every piece. Don't worry about breaking some of the noodles.
Line two baking sheets with parchment or waxed paper. Use a cookie scoop or two spoons to scoop out some of the coated noodles, dropping onto the baking sheet to make a haystack shape.
Let the haystacks rest until the coating is firm. You can speed this up by placing them in the refrigerator.
Notes
Store in the refrigerator for 1 week or freeze for 6 months.
Nutrition information is an estimate based on online calculators and provided as a courtesy. Any nutritional information should be used as a general guideline only.