In a medium microwave-safe bowl, combine the butterscotch chips and peanut butter. Microwave in 30-second intervals, stirring between each, until the mixture is smooth and completely melted (about 1-1.5 minutes).
Remove the bowl from the microwave and stir in the vanilla extract and a pinch of sea salt until well mixed.
Gently fold in the chow mein noodles, shredded coconut, and mini marshmallows. Make sure everything is well coated with the butterscotch mixture.
Using a spoon or cookie scoop, drop heaping tablespoons of the mixture onto a parchment-lined baking sheet, forming little haystack shapes.
Allow the cookies to cool at room temperature for about 30 minutes, or until set. For quicker results, you can place them in the refrigerator for about 10-15 minutes.
Once cooled and set, transfer the cookies to a serving plate.
Notes
Serve the cookies on a decorative platter, and consider garnishing with extra shredded coconut or a drizzle of melted chocolate.