In a large pot or wok over medium-high heat, add about 1 inch oil. Heat until it swirls and reaches 375 degrees F. Line a baking sheet with paper towels.
Separate and break the noodles into 4- to 6-inch sections. Test the oil with a few strands; they should almost instantly get puffy. When the oil is ready, add the noodles in batches and cook until puffy, then remove to the paper towels. Season with a pinch of salt and a dusting of cinnamon sugar over the top.