Mediterranean Confetti Quinoa Salad

uncooked quinoa

small- to medium-sized head radicchio, cored and finely chopped (to yield about 2 cups)

-ounce bag baby spinach, finely chopped

sun-dried tomatoes, finely chopped

grated parmesan cheese (see note)

finely chopped fresh basil

reduced-fat feta cheese

pine nuts, toasted

garlic, minced

finely chopped kalamata olives, optional

balsamic vinegar (or white balsamic – see note)

extra-virgin olive oil

kosher salt

ground black pepper