Start by rinsing the quinoa under cold water to remove its natural coating. In a medium saucepan, combine the rinsed quinoa with chicken broth and smashed garlic. Bring to a boil, then reduce heat, cover, and simmer for 15 minutes until fluffy. Remove from heat and let sit covered for 5 minutes.
While the quinoa cooks, heat a skillet over medium heat. Add the diced chicken breast and cook until heated through and slightly browned, about 5-7 minutes. Set aside.
In a large mixing bowl, combine the diced red onion, red bell pepper, chopped kalamata olives, parsley, and chives.
In a separate bowl, whisk together the lemon juice, balsamic vinegar, and olive oil. Season with salt and pepper to taste.
Once the quinoa has cooled slightly, fluff it with a fork and add it to the bowl with vegetables. Stir in the cooked chicken and crumble feta cheese on top. Drizzle dressing over and toss to combine.
Serve immediately or chill in the refrigerator for 30 minutes to meld flavors. Enjoy as a main dish or side!