Slice the chicken breast into thin, even strips and place them in a medium mixing bowl.
Toss the chicken with the cumin, coriander, turmeric, garlic powder, sea salt, and black pepper until every piece is thoroughly coated.
Heat the olive oil in a large non-stick skillet over medium-high heat until shimmering.
Add the seasoned chicken to the skillet and sauté for 6 to 8 minutes, stirring occasionally, until the exterior is golden brown and the center is cooked through.
While the chicken is cooking, prepare the sauce by whisking together the tahini and lemon juice in a small ramekin, adding a teaspoon of warm water at a time until it reaches a smooth, pourable consistency.
In a small bowl, combine the diced cucumber, diced tomato, and sliced red onion to create a quick Mediterranean salsa.
To assemble, scoop the warm cooked basmati rice into a serving bowl and top it with the spiced chicken strips and the fresh vegetable mixture.
Finish the dish by drizzling the creamy lemon-tahini sauce over the top and serve immediately.