Dice the chicken breast into bite-sized pieces and place them in a bowl.
Toss the chicken with the ground cumin, coriander, turmeric, garlic powder, sea salt, and black pepper until evenly coated.
Heat the olive oil in a non-stick skillet over medium-high heat and add the seasoned chicken.
Sauté the chicken for 6-8 minutes, turning occasionally, until golden brown and cooked through.
While the chicken is cooking, finely dice the cucumber and red onion, and halve the cherry tomatoes.
In a small bowl, combine the diced vegetables with half of the lemon juice and a pinch of salt to create a fresh salad.
In another small bowl, whisk together the Greek yogurt, tahini, and the remaining lemon juice until the sauce is smooth and creamy.
Place the warm cooked basmati rice in the bottom of a bowl and top with the seared chicken and the cucumber-tomato salad.
Drizzle the yogurt-tahini sauce over the entire bowl and serve immediately.