Slice the chicken breast into thin strips and place them in a medium mixing bowl.
Toss the chicken with the ground cumin, coriander, turmeric, garlic powder, sea salt, and black pepper until every piece is evenly coated.
Heat the olive oil in a non-stick skillet over medium-high heat.
Add the chicken to the skillet and sauté for 6 to 8 minutes, stirring occasionally, until the meat is golden brown and cooked through.
In a small ramekin, whisk together the tahini and lemon juice, adding a teaspoon of water at a time until it reaches a smooth, pourable consistency.
In a separate small bowl, toss the diced cucumber, tomato, and minced red onion together to create a fresh relish.
Place the warm cooked basmati rice in the center of a serving bowl.
Arrange the spiced chicken and the cucumber-tomato salad over the rice.
Finish the dish by drizzling the creamy tahini sauce over the top and serve immediately.