Slice the chicken breast into thin bite-sized strips and place them in a small bowl.
In a small ramekin, whisk together the cumin, coriander, turmeric, garlic powder, paprika, sea salt, and black pepper.
Toss the chicken strips with the spice blend until evenly coated.
Heat the olive oil in a non-stick skillet over medium-high heat and sauté the chicken 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 small jar, whisk the tahini, lemon juice, and water until smooth to create a creamy dressing.
Place the warm cooked brown rice in the base of a bowl.
Top the rice with the spiced chicken, chopped cucumber, tomatoes, and red onion.
Drizzle the tahini dressing over the entire bowl and serve immediately.