In a small bowl, whisk together the cumin, coriander, turmeric, paprika, garlic powder, sea salt, and black pepper to create the shawarma seasoning.
Slice the chicken breast into thin, even strips and toss thoroughly with the spice blend until every piece is well-coated.
Heat the olive oil in a large skillet over medium-high heat; once shimmering, add the chicken and sauté for 6-8 minutes until golden brown and cooked through.
While the chicken sears, whisk the Greek yogurt, tahini, and lemon juice in a small ramekin until the sauce is smooth and creamy.
In a separate bowl, combine the diced cucumber, halved cherry tomatoes, and minced red onion for a quick, fresh relish.
Assemble the bowl by placing the warm cooked rice at the base, then topping it with the spiced chicken and the fresh vegetable mixture.
Finish the dish by drizzling the tangy yogurt sauce over the top and garnishing with a sprinkle of fresh parsley.