Slice the chicken breast into thin strips and place them in a bowl with the olive oil, cumin, paprika, turmeric, garlic powder, salt, and pepper.
Toss the chicken until every piece is evenly coated in the spice mixture.
Heat a large non-stick skillet over medium-high heat and add the chicken, cooking for 6 to 8 minutes until golden brown and fully cooked.
While the chicken cooks, whisk together the tahini and lemon juice in a small ramekin, adding a teaspoon of water at a time until it reaches a smooth, pourable consistency.
In a separate small bowl, toss together the diced cucumber, tomato, red onion, and fresh parsley to create a quick Mediterranean salad.
Place the warm cooked brown rice in the base of a bowl and top it with the spiced chicken and the fresh vegetable salad.
Finish the dish by drizzling the creamy lemon-tahini sauce over the top and serve immediately.