Start with cooled but still slightly warm quinoa if you have it, or room-temperature works too. I always cook my quinoa an hour ahead so it's ready when I need it. This timing gives me freedom to prep other dishes without stress.
Chop your chicken into bite-sized pieces about the size of chickpeas so every forkful has protein. I grill mine until just cooked through, never longer, because overcooked chicken gets stringy and disappoints everyone. Use a meat thermometer set to 165 degrees Fahrenheit if you're uncertain.
Halve your cherry tomatoes and cut cucumber into half-moons so they match the chickpea size. Uniformly-sized vegetables actually taste better together because they release juices at the same rate. I learned this the hard way after years of unevenly chopped salads that separated by hour two.
Dice your red bell pepper and red onion into small, quick-bite pieces since raw onion can overwhelm if you use too much. Start with less red onion than you think you need — you can always add more, but you cannot remove it. Tom taught me that lesson after I made a version that tasted purely like onions.
Drain and rinse your canned chickpeas, then pat them dry with paper towels so the dressing actually coats them. Wet chickpeas slip off your fork and absorb less flavor, which defeats the entire purpose of this summer quinoa salad family recipe. It takes thirty seconds but changes everything.
Make your dressing by whisking together olive oil, lemon juice, salt, and pepper in a small bowl. Taste it straight from the spoon — the lemon should hit first, then the salt rounds out behind. This is your moment to adjust because dressing flavors are final once they hit the salad.
Combine warm quinoa with the dressing first, before adding vegetables, so every grain gets coated. Stir gently for about one minute and let it sit for two minutes. This is the step that separates restaurant-quality from "we threw stuff together," and I never skip it even when I'm rushed.
Add vegetables and chickpeas last, then crumble feta cheese and scatter fresh herbs on top right before serving. Mixing herbs in too early breaks them down and turns them dark and bitter. Save them for the top so they stay bright green and taste fresh.