Whisk the dressing together in a glass measuring cup. Pour over the pasta salad and toss. Mix in the green onions and add additional chili oil or pepper as needed. Serve topped with chicken and chopped cilantro. If you make the salad ahead of time, wait to add the dressing, green onions and cilantro until just before serving.
Chili oil is a chili-infused oil found in the Asian food section of the grocery.
Usually sesame oil is used and is the most flavorful. Keep refrigerated because oils can become rancid when left at room temperature for too long. Toasted sesame oil has a much richer flavor than plain sesame oil and can also be found in the Asian section of the grocery. Less oil is needed when you use the toasted oil because it's so flavorful. Measure out equal amounts of seeds and black peppercorns into a skillet over medium-high heat.