Line a baking sheet with parchment paper or a silicone mat to prevent sticking.
In a mixing bowl, combine the peanut butter, powdered sugar, vanilla extract, and a pinch of salt. Stir until smooth and well combined.
In a microwave-safe bowl, melt the chocolate chips in 30-second intervals, stirring between each interval, until fully melted and smooth.
Once the chocolate is melted, pour it into the peanut butter mixture. Stir until the chocolate and peanut butter blend together completely.
Add the chow mein noodles to the mixture, gently folding them in until they are fully coated with the chocolate-peanut butter mixture.
Using a spoon, scoop out portions of the mixture and drop them onto the prepared baking sheet, forming small haystack shapes.
Allow the haystacks to set at room temperature for about 10-15 minutes, or place them in the refrigerator to speed up the setting process.
Once set, enjoy your Easy No-Bake Peanut Butter Haystacks!