Grill the chicken breasts until cooked through and juices run clear. Let them rest before slicing.
Cook the quinoa according to package instructions, then fluff with a fork and allow to cool.
In a large bowl, combine the cooked quinoa, cucumber, tomatoes, red onion, olives, and feta cheese.
In a separate bowl, whisk together olive oil, lemon juice, minced garlic, oregano, salt, and pepper to create the dressing.
Pour dressing over the salad and toss to combine.
Serve the salad topped with slices of grilled chicken.
Notes
Tips for feeding the kids:
Make it interactive: Serve the quinoa salad “deconstructed” with each ingredient in its own bowl so kids can build their own salad, taking as much or as little of each component as they like.