Slice the chicken breast into thin strips and place them in a small bowl.
Toss the chicken with the olive oil, cumin, coriander, turmeric, garlic powder, sea salt, and black pepper until evenly coated.
Heat a non-stick skillet over medium-high heat and sear the chicken until golden brown and cooked through, approximately 6 to 8 minutes.
While the chicken cooks, dice the cucumber, halve the cherry tomatoes, and finely mince the red onion.
Combine the chopped vegetables in a small bowl with half of the lemon juice and the fresh parsley.
Place the warm cooked brown rice in a serving bowl and top it with the spiced chicken and the fresh vegetable salad.
In a small ramekin, whisk the tahini with the remaining lemon juice and a teaspoon of warm water until smooth and creamy.
Drizzle the tahini sauce over the bowl and serve immediately.