Preheat your oven to 400°F (200°C).
In a medium bowl, whisk together the olive oil, lemon juice, minced garlic, cumin, coriander, turmeric, sea salt, and black pepper to create a marinade.
Slice the chicken breast into thin, bite-sized strips and toss them in the marinade until evenly coated.
Spread the chicken strips in a single layer on a parchment-lined baking sheet and roast for 15-18 minutes until the edges are golden and the chicken is cooked through.
While the chicken roasts, combine the diced cucumber, tomato, and finely chopped red onion in a small bowl to make a fresh salad.
To assemble, place the warm cooked brown rice in a bowl, top with the roasted chicken shawarma, add the fresh vegetable salad, and finish with a creamy dollop of Greek yogurt.