Vinaigrette:
In a small bowl or glass jar, whisk together all the ingredients. Set aside or if not using right away, refrigerate until ready to use.
Chicken:
Place chicken in a large bowl and season with salt + pepper. Pour vinaigrette over the chicken and marinate for at least 20 minutes to 1 hour. Drain the chicken from the marinade, discarding the marinade.
Preheat oven to 425°F. Line a sheet pan with parchment paper or spray with oil to coat the bottom of the pan.
Arrange chicken in prepared pan; transfer to the oven. Roast for 35-40 minutes or until the internal temperature of the chicken reaches 165°F and golden brown in color.
Remove from oven and cover with foil for 10-15 minutes. Slice and set aside until ready to assemble the salad.
Salad:
Place lettuce in a large serving bowl. In a separate large bowl, combine tomatoes, quinoa, bell peppers, red onion, and olives; gently toss to coat. Drizzle remaining vinaigrette (to taste) over lettuce, add tomato and pepper mixture to the bowl with the lettuce. Top with sliced chicken, feta, hummus, and pita bread or chips on the side. Taste and adjust for more freshly ground black pepper if desired. Enjoy!