Slice the chicken breast into thin, bite-sized strips.
In a small bowl, whisk together the cumin, coriander, turmeric, garlic powder, sea salt, and black pepper.
Toss the chicken strips in the spice mixture until evenly coated.
Heat the olive oil in a large skillet over medium-high heat. Add the chicken and sauté for 6-8 minutes until golden brown and cooked through.
While the chicken cooks, dice the cucumber, halve the cherry tomatoes, and finely mince the red onion.
In a separate small bowl, whisk the Greek yogurt, lemon juice, and tahini until the sauce is smooth and creamy.
Place the warm cooked rice in the center of a bowl.
Top the rice with the spiced chicken and the fresh vegetable mixture.
Drizzle the lemon-tahini yogurt sauce over the entire bowl and serve immediately.