Slice the chicken breast into thin, bite-sized strips and place them in a medium mixing bowl.
Add the cumin, coriander, smoked paprika, turmeric, garlic powder, sea salt, and black pepper to the chicken, tossing until every piece is evenly coated.
Heat the extra virgin olive oil in a large skillet over medium-high heat.
Add the seasoned chicken to the skillet and sauté for 6-8 minutes, or until the chicken is golden brown and cooked through.
While the chicken cooks, prepare the sauce by whisking the Greek yogurt, tahini, and lemon juice in a small bowl until creamy and smooth.
Dice the cucumber, tomato, and red onion into small cubes to create a fresh vegetable medley.
To assemble, place the warm cooked brown rice in the bottom of a bowl.
Top the rice with the spiced chicken and the fresh vegetable medley.
Finish the dish by drizzling the tahini-yogurt sauce over the top before serving.