Cook the quinoa according to package directions. Cool completely.
Place the quinoa in a large mixing bowl. Add the garbanzo beans, feta cheese, bell pepper, scallions, and cilantro. Add enough vinaigrette to moisten. Toss gently. Adjust seasonings and add more vinaigrette if desired.
Chill until ready to serve.
Store leftovers in the fridge, covered, for up to 4 days.