In a bowl, mix olive oil, lemon juice, cumin, coriander, paprika, turmeric, cinnamon, garlic powder, cayenne (if using), salt, and pepper. Add chicken and marinate for at least 20 minutes (or up to overnight).
Heat a skillet over medium heat and cook marinated chicken for 5-7 minutes per side until cooked through and golden brown. Let rest and slice.
In a small bowl, whisk together tahini, lemon juice, garlic, and salt. Add water gradually to thin the sauce to desired consistency.
Assemble bowls: Start with your choice of rice, quinoa, or cauliflower rice. Add the fresh vegetables. Top with sliced chicken and drizzle with tahini sauce.
Garnish with chopped parsley or mint and optional toppings like pickled onions, olives, or feta cheese. Serve immediately.