Slice the chicken breast into bite-sized strips and toss in a bowl with olive oil, cumin, coriander, turmeric, garlic powder, onion powder, sea salt, and black pepper.
Heat a large non-stick skillet over medium-high heat and add the seasoned chicken, cooking 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 ramekin, whisk together the tahini and lemon juice, adding a teaspoon of water at a time until it reaches a smooth, drizzling consistency.
Place the warm cooked brown rice in the center of a bowl.
Arrange the spiced chicken, cucumbers, tomatoes, and red onion over the rice.
Finish the dish by drizzling the creamy tahini sauce over the top.