01 - Whisk olive oil, cumin, coriander, paprika, turmeric, cinnamon, cayenne, garlic, salt, pepper, and lemon juice in a large bowl. Add chicken, toss to coat, cover, and refrigerate for 20 minutes to 2 hours.
02 - Rinse basmati rice under cold water until clear. Combine rice, water, salt, and olive oil in a saucepan. Bring to a boil, reduce heat, cover, and simmer for 12–15 minutes until water is absorbed. Fluff with a fork and keep warm.
03 - Heat grill pan or skillet over medium-high heat. Remove chicken from marinade and cook 5–6 minutes per side until golden and cooked through. Rest for 5 minutes, then slice into strips.
04 - While chicken cooks, dice cucumber, halve cherry tomatoes, slice red onion, chop parsley, and cut lemon into wedges.
05 - Divide rice among four bowls. Layer salad greens, sliced chicken, hummus, cucumber, tomatoes, red onion, and parsley. Sprinkle sumac over vegetables if desired. Serve with lemon wedges.
06 - Mix Greek yogurt, lemon juice, mint, salt, and pepper in a small bowl. Drizzle over bowls if desired.