Slice the chicken breast into thin bite-sized strips and place them in a bowl.
Toss the chicken with the cumin, coriander, turmeric, garlic powder, smoked paprika, sea salt, and black pepper until evenly coated.
Heat the olive oil in a large skillet over medium-high heat.
Add the seasoned chicken to the skillet and sauté for 6 to 8 minutes until golden brown and cooked through.
While the chicken cooks, dice the cucumber, tomato, and red onion into small pieces.
In a small bowl, whisk together the tahini and lemon juice, adding a teaspoon of water at a time until it reaches a pourable consistency.
Place the warm cooked brown rice in the base of a serving bowl.
Top the rice with the spiced chicken and the fresh vegetable mixture.
Drizzle the creamy tahini dressing over the entire bowl and serve immediately.