Trim and flatten the chicken: pat the breasts dry with paper towels and, if they are uneven in thickness, butterfly or lightly pound to an even thickness (~1¼ in / 3 cm). Why: an even thickness ensures the chicken cooks uniformly and prevents thin edges from drying out before the center reaches a safe temperature.

Make a quick lemon-herb marinade: in a bowl combine 1 tbsp lemon juice, 1 clove minced garlic, 1/2 tsp kosher salt, 1/4 tsp black pepper, 1/2 tsp dried oregano and 1 tbsp olive oil. Add the chicken and turn to coat. Let sit 10–15 minutes at room temperature (no longer than 30 minutes with citrus). Why: a short citrus-based marinade brightens flavor and helps season the surface. Avoid marinating too long in acid to prevent the meat from becoming mealy.

Preheat your cooking surface: heat a gas grill, grill pan, or heavy skillet over medium-high heat until hot and shimmering (about 3–5 minutes). Add a thin film of oil to the pan or brush the grill grates to prevent sticking. Why: a properly preheated surface creates a quick sear (Maillard reaction) that builds flavor and creates an attractive golden crust, while oil prevents sticking and tearing.

Cook the chicken: place the breasts on the hot grill or skillet and sear undisturbed 4–6 minutes per side (depending on thickness) until the internal temperature reads 74°C / 165°F at the thickest point. If using a grill, leave the lid open for direct heat cooking and rotate for cross-hatch marks if desired. Why: cooking to the proper temperature ensures food safety; searing without flipping too soon maximizes crust development and flavor.

Rest the chicken: transfer cooked breasts to a cutting board and tent loosely with foil for 5–7 minutes. Why: resting allows the juices to redistribute and the meat to finish cooking gently, producing juicier slices and avoiding dry, stringy texture.

Warm and season the quinoa: while the chicken rests, place the cooked quinoa in a saucepan over low heat with a drizzle (1 tsp) of olive oil, a pinch of salt, and 1 tbsp lemon juice and stir until warmed through, 2–3 minutes. Fluff with a fork and fold in half the chopped parsley. Why: reheating quinoa with a touch of acid and oil refreshes its flavor and helps the grains separate for a light, non-clumpy texture.

Prepare the vegetables: halve the cherry tomatoes, slice the cucumber, slice the avocado and keep the slices intact; toss the avocado in a teaspoon of lemon juice to slow browning. Combine mixed greens, tomatoes, cucumber and the remaining parsley in a large bowl. Why: keeping ingredients separately prepared allows you to control texture and temperature in the final assembly; acid on avocado preserves color and adds brightness.

Make the dressing: in a small bowl whisk together 4 tbsp olive oil, 4 tbsp fresh lemon juice, the remaining 1 tsp kosher salt, 1/4 tsp black pepper, 1/4 tsp dried oregano, minced red onion (optional), and red pepper flakes if using—taste and adjust. Why: emulsifying oil and acid with aromatics creates a balanced, bright dressing that carries through every bite. Adding onion to the dressing mellows its raw sharpness while infusing savory depth.

Assemble the salad: place a bed of mixed greens on four plates. Spoon approximately 140 g (about 3/4 cup) warmed quinoa onto each plate in a ring or mound. Fan avocado slices over the quinoa, distribute cucumber and tomatoes evenly, and crumble feta on top if using. Why: building the salad with a grain base gives it substance and structure; arranging ingredients in layers highlights colors and textures.

Slice and finish the chicken: slice the rested breasts thinly on the diagonal and place on top of each salad. Drizzle each plate with the lemon-olive oil dressing (about 1 tbsp olive oil + lemon juice worth per person) and finish with a sprinkle of parsley, a pinch of smoked paprika for color (optional), and cracked black pepper. Why: slicing on the diagonal increases surface area and creates elegant, tender pieces that integrate with the salad. Dress at the end so greens don’t wilt.

Final taste check: taste one serving and adjust with extra lemon, salt or pepper as needed. Serve immediately. Why: a last-minute adjustment ensures balance—acid, salt and fat should be in harmony and each component should shine.