Make the marinade. In a bowl, whisk olive oil, garlic, cumin, coriander, paprika, turmeric, cinnamon, pepper, salt, lemon zest, and lemon juice until glossy and fragrant.
Prep the chicken. Pat the chicken dry and slice large pieces into even strips for faster, more even cooking.
Toss with the marinade to coat well.
Marinate. Cover and chill for at least 30 minutes, up to 12 hours. Longer time boosts flavor and tenderness.
Cook the grains. Prepare brown rice, quinoa, or couscous according to package directions. Fluff with a fork and set aside.
Mix the sauce. For the tahini option, whisk tahini, lemon, and garlic.
Add warm water a tablespoon at a time until creamy and pourable. For the yogurt option, stir yogurt with lemon, garlic, olive oil, and salt until smooth.
Chop the veggies. Dice cucumber and tomatoes, slice red onion, and chop herbs. Keep everything bite-sized for easy eating.
Cook the chicken. Heat a large skillet over medium-high.
Add a drizzle of oil and cook the chicken in a single layer, 4–6 minutes per side, until browned and cooked through. Internal temp should reach 165°F (74°C).
Rest and slice. Let the chicken rest for 5 minutes. Slice into strips or bite-sized pieces to show off those caramelized edges.
Assemble the bowls. Add a scoop of grains and a handful of greens to each bowl.
Top with chicken, cucumber, tomatoes, onion, carrots, and herbs. Add pickled onions and avocado if using.
Finish with sauce and crunch. Drizzle generously with the sauce. Sprinkle feta or nuts on top for a savory crunch.
Taste and add a pinch of salt or a squeeze of lemon if needed.