Slice chicken into bite-sized pieces and toss with cumin, coriander, turmeric, garlic powder, salt, and pepper.
Heat olive oil in a large skillet over medium-high heat and sear the chicken until golden brown and cooked through, about 6-8 minutes.
In the same skillet, briefly sauté the cauliflower rice until tender-crisp, about 3-4 minutes.
Prepare the dressing by whisking together the Greek yogurt, tahini, and lemon juice in a small bowl.
Assemble the bowl by layering the cauliflower rice, spiced chicken, diced cucumber, halved cherry tomatoes, and sliced red onion.
Garnish with fresh parsley and drizzle with the creamy lemon-tahini sauce before serving.