Make the marinade and dress the chicken: In a bowl whisk 1 tbsp olive oil, 1 tbsp lemon juice, 1 tsp lemon zest, 1 minced garlic clove, 1 tsp chopped fresh thyme (or 1/2 tsp dried), 1 tsp kosher salt and 1/2 tsp black pepper. Add the chicken and turn to coat. Let sit 15–20 minutes at room temperature or up to 2 hours in the refrigerator. Why: brief marination infuses bright citrus and herbs into the meat and the salt begins to season and tenderize the chicken; room-temperature chicken cooks more evenly.

If you don't already have cooked quinoa and roasted beets, start them now: Rinse 1/2 cup dry quinoa and cook with 1 cup water (bring to a boil, cover, reduce to a simmer for 12–15 minutes until water is absorbed). Fluff and cool. For roasted beets: preheat oven to 400°F (200°C), wrap trimmed beets in foil with a drizzle of oil and roast 35–45 minutes until tender. Why: quinoa provides nutty texture and body to the salad; roasting concentrates the beets' sweetness and softens their texture so they balance the greens and avocado.

Prepare the vinaigrette: In a jar or bowl combine 3 tbsp extra-virgin olive oil, 2 tbsp fresh lemon juice, 1 tbsp Dijon, 1 tbsp honey, 1 minced garlic clove, 1/4 tsp salt and 1/4 tsp black pepper. Whisk or shake vigorously until emulsified. Taste and adjust acidity or sweetness. Why: emulsifying the oil and acid coats the vegetables and protein evenly; honey balances the lemon's brightness and the mustard stabilizes the dressing.

Toast the walnuts and finish produce: Place walnuts in a dry skillet over medium heat and toast, shaking the pan, until fragrant and lightly browned (2–4 minutes). Cool and roughly chop. While they cool, halve the cherry tomatoes, slice the cucumber, crumble the feta, and slice the avocado just before plating to avoid browning. Why: toasting walnuts deepens their flavor and adds a warm crunch; prepping produce ahead speeds assembly and keeps textures bright.

Cook the chicken: Heat a grill pan or outdoor grill to medium-high (about 425°F/220°C surface). Pat chicken dry (this encourages a good sear), then grill 4–6 minutes per side until an instant-read thermometer reads 165°F (74°C) at the thickest part. Rest the chicken 5–7 minutes tented in foil before slicing. Why: high-heat searing develops Maillard browning for flavor; resting lets juices redistribute so slices remain moist.

Assemble the composed salad: On a large platter or individual plates place the mixed greens as the base. Scatter 1 cup cooked quinoa across the greens, then arrange diced roasted beets, halved cherry tomatoes, cucumber slices, avocado slices, pickled red onion and crumbled feta in separate clusters for color contrast. Why: arranging ingredients in clusters makes every forkful interesting and visually appealing — a hallmark of restaurant plating.

Slice the rested chicken thinly against the grain and fan over the salad. Sprinkle chopped toasted walnuts over the top. Drizzle the honey-Dijon vinaigrette over the salad (start with half, toss lightly, then add more to taste). Why: slicing against the grain shortens muscle fibers for a more tender bite; adding dressing in stages avoids overdressing and keeps textures crisp.

Finish and serve: Grind a little extra black pepper over the plates and, if desired, scatter microgreens or small herb leaves (parsley, dill, or basil). Serve immediately so avocado and greens stay fresh. Why: a final grind of pepper and herbs adds aroma and a fresh finishing note that elevates the dish.