Slice the chicken breast into thin strips and place them in a medium mixing bowl.
In a small ramekin, whisk together the olive oil, cumin, smoked paprika, turmeric, garlic powder, sea salt, and black pepper.
Pour the spice marinade over the chicken and toss until every piece is thoroughly coated.
Heat a non-stick skillet over medium-high heat and add the chicken, searing for 5-7 minutes until cooked through and slightly charred on the edges.
While the chicken cooks, dice the cucumber, halve the cherry tomatoes, and thinly slice the red onion.
Prepare the dressing by whisking the tahini, lemon juice, and water in a small bowl until smooth and pourable.
Place the warm cooked brown rice in a serving bowl and top with the spiced chicken and fresh vegetable salad.
Finish by drizzling the tahini sauce over the entire bowl and serve immediately.