Cut the chicken breast into bite-sized pieces and toss in a bowl with cumin, coriander, turmeric, garlic powder, sea salt, and black pepper until evenly coated.
Heat the olive oil in a non-stick skillet over medium-high heat and add the seasoned chicken, sautéing for 6 to 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, then combine them in a small bowl.
Prepare the tahini dressing by whisking together the tahini, lemon juice, and water in a small ramekin until the texture is smooth and pourable.
Assemble the bowl by placing the cooked basmati rice at the bottom, topping it with the spiced chicken and the fresh vegetable salad.
Finish the dish by drizzling the creamy tahini sauce over the top and serving immediately.