Make the quick lemon-herb marinade: In a bowl combine 1 tsp olive oil, 1 tbsp lemon juice, 1/4 tsp salt, 1/4 tsp black pepper, 1/2 tsp dried oregano, half the minced garlic (reserve the rest for the dressing) and 1 tbsp chopped parsley. Whisk briefly. Why: A short, acidic marinade (lemon + a touch of oil) will lightly flavor and tenderize the thin chicken breasts without making the surface mushy — you only need 10–20 minutes for these small breasts.

Pound or butterfly the chicken (if thick): If the breasts are uneven, press them to an even thickness (about 3/4 inch / 2 cm) with the flat side of a meat mallet or the bottom of a heavy pan, or butterfly thicker pieces. Why: Even thickness ensures the chicken cooks evenly and quickly so the outside caramelizes without the inside drying out.

Marinate the chicken: Place the chicken in the bowl or a zip-top bag, coat with the marinade and let sit at room temperature for 10–20 minutes while you prepare the rest of the salad. Why: Room-temperature chicken hits the hot pan more evenly and the brief marinate infuses flavor without toughness.

Make the tahini-lemon dressing: In a small bowl combine 2 tbsp tahini, 1 tbsp lemon juice (reserve 1 tbsp for the chicken marinade used above), the remaining minced garlic, 1 tbsp olive oil, 1/4 tsp salt and 1/4 tsp black pepper. Whisk — it will be thick. Add 1–2 tbsp water, a little at a time, to loosen to a pourable consistency. Stir in the lemon zest and the remaining 1 tbsp chopped parsley. Why: Whisking tahini with acid and a little oil breaks up its texture and bloom the sesame flavor; thinning with water keeps the dressing bright and silky without adding more oil.

Warm the quinoa if needed: If your quinoa was cooked earlier and chilled, heat briefly in a microwave-safe bowl or warm in a skillet with a splash of water. Fluff with a fork and season with a pinch of salt and 1/2 tsp lemon juice. Why: Warm grains pair better with warm chicken and help carry the dressing flavors into the salad components.

Preheat a grill pan or heavy skillet over medium-high heat. Brush the chicken lightly with the reserved marinade or a little oil and season the surface with a pinch of salt and pepper just before cooking. Why: High heat creates Maillard browning (a golden-brown crust) that adds savory, caramelized flavor and a pleasing texture contrast to the bright salad.

Cook the chicken: Add the breasts to the hot pan and cook undisturbed for 4–5 minutes until a golden crust forms. Flip and cook another 3–5 minutes until an instant-read thermometer inserted in the thickest part reads 160–162°F (71–72°C). Remove and tent loosely with foil for 5 minutes (carryover heat will bring it to a safe 165°F). Why: Cooking undisturbed creates a crust; tenting lets juices redistribute so the chicken stays juicy.

Assemble the salad base: On two plates divide the mixed greens, warm quinoa, halved cherry tomatoes, and diced cucumber. Crumble feta over the salads if using. Why: Building the salad with a warm component (quinoa and chicken) makes the whole dish feel more composed and restaurant-quality — the warm elements soften the greens slightly and help meld flavors.

Slice the chicken: Thinly slice the rested chicken across the grain into 1/4-inch slices and fan over each plated salad. Drizzle each plate with half the tahini-lemon dressing and finish with an extra sprinkle of chopped parsley, a grind of black pepper and a small squeeze of lemon if desired. Why: Slicing across the grain shortens muscle fibers for a more tender bite; finishing touches brighten the dish visually and flavor-wise.

Serve immediately: Serve while the chicken and quinoa are still slightly warm so the dressing loosens and coats everything. Why: Temperature contrast (warm chicken/grain + cool greens) enhances texture and flavor interplay in the salad.