Marinate the chicken: In a bowl, combine olive oil, lemon juice, minced garlic, cumin, paprika, coriander, turmeric, cinnamon, cayenne (if using), salt, and pepper. Add the chicken breasts and coat thoroughly. Let the chicken marinate in the fridge for at least 30 minutes, or up to 2 hours.
- Cook the chicken: Preheat the grill or a skillet over medium-high heat. Grill the chicken for 5-7 minutes per side, or until the chicken reaches an internal temperature of 165°F (74°C). Let the chicken rest for a few minutes before slicing it into thin strips.
- Prepare the salad: Combine the diced cucumber, cherry tomatoes, sliced red onion, chopped parsley or cilantro, and shredded lettuce or greens in a large bowl. Toss to combine.
- Make the tzatziki sauce: In a small bowl, mix the Greek yogurt, lemon juice, olive oil, minced garlic, fresh dill, salt, and pepper until smooth. Adjust seasoning to taste.
- Make the tahini dressing: In another small bowl, whisk together tahini, lemon juice, olive oil, and water until smooth. Add water to reach desired consistency. Season with salt and pepper.
- Assemble the bowls: Divide the salad mixture into 4 bowls. Top each with sliced chicken, a dollop of tzatziki, and a drizzle of tahini dressing. Garnish with additional parsley or cilantro if desired.
- Serve: Serve immediately, or refrigerate for meal prep. Enjoy cold or at room temperature.