Slice the chicken breast into thin bite-sized strips and place them in a small mixing bowl.
Toss the chicken with the 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.
Add the seasoned chicken to the skillet and sear for 5-7 minutes, turning occasionally, until golden brown and cooked through.
While the chicken cooks, whisk together the Greek yogurt and lemon juice in a small bowl to create the sauce.
Dice the cucumber, halve the cherry tomatoes, and finely mince the red onion.
Place the warm cooked brown rice in the base of a serving bowl.
Top the rice with the seared chicken strips and the prepared fresh vegetables.
Finish by drizzling the lemon-yogurt sauce over the entire bowl before serving.