In a medium bowl, whisk together 0.5 tsp olive oil, lemon juice, cumin, paprika, turmeric, garlic powder, salt, and pepper.
Cut the chicken breast into bite-sized pieces and toss in the spice marinade until evenly coated.
Heat the remaining 0.5 tsp olive oil in a non-stick skillet over medium-high heat.
Add the chicken to the skillet and cook for 6-8 minutes, stirring occasionally, until golden brown and cooked through.
While the chicken cooks, dice the cucumber, halve the cherry tomatoes, and finely mince the red onion.
Warm the pre-cooked brown rice and place it in the bottom of a serving bowl.
Top the rice with the cooked chicken and the fresh vegetable mixture.
Garnish with a dollop of Greek yogurt and freshly chopped parsley before serving.