Slice the chicken breast into thin, even strips to ensure quick and uniform cooking.
In a medium bowl, whisk together the olive oil, lemon juice, cumin, coriander, turmeric, garlic powder, sea salt, and black pepper.
Add the chicken strips to the bowl and toss thoroughly until every piece is well-coated in the spice marinade.
Heat a large non-stick skillet over medium-high heat and add the marinated chicken.
Sauté the chicken for 6-8 minutes, stirring occasionally, until the exterior is golden brown and the meat is cooked through.
While the chicken cooks, dice the cucumber and halve the cherry tomatoes.
Place the warm cooked brown rice into a serving bowl as the base.
Layer the seared chicken, cucumber, and tomatoes over the rice.
Top the bowl with a dollop of plain Greek yogurt and serve immediately.