Slice the chicken breast into thin bite-sized strips.
In a small bowl, combine the cumin, coriander, turmeric, garlic powder, sea salt, and black pepper.
Toss the chicken strips with the spice mixture until thoroughly and evenly coated.
Heat the olive oil in a non-stick skillet over medium-high heat.
Add the chicken to the skillet and cook for 6 to 8 minutes, stirring occasionally, until golden brown and cooked through.
While the chicken is cooking, whisk together the tahini, lemon juice, and water in a small jar until the sauce is smooth and pourable.
Place the warm cooked basmati rice in the bottom of a serving bowl.
Arrange the cooked chicken, diced cucumber, halved cherry tomatoes, and sliced red onion over the rice.
Drizzle the creamy tahini sauce over the top and serve immediately.