Line a baking sheet or large tray with parchment paper or wax paper. Set it aside so it is ready when the mixture is done.
Add the dark chocolate chips to a microwave-safe bowl. Heat in 30-second intervals, stirring well each time, until fully melted and smooth. (You can also melt the chocolate slowly in a saucepan over low heat, stirring often.)
12 ounces dark chocolate
Once the chocolate is melted, add the shoestring potatoes and the nuts to the bowl. Stir gently until everything is well coated with chocolate. Take your time so the potatoes do not break too much.
3 cups shoestring potato chips, 2 cups peanuts
Use a spoon to drop small mounds of the mixture onto the lined baking sheet. Leave a little space between each one so they can set without sticking together.
Let the haystacks sit at room temperature until firm. This usually takes about 30 minutes. You can place them in the refrigerator to speed things up if needed.
Once set, remove them from the paper and store in an airtight container until ready to serve.