In a small bowl, whisk together the ground cumin, smoked paprika, turmeric, garlic powder, sea salt, and black pepper.
Coat the chicken breast evenly on both sides with the spice blend, pressing it in to ensure it sticks.
Heat the olive oil in a non-stick skillet over medium-high heat and sear the chicken for 6 to 7 minutes per side until golden brown and cooked through.
While the chicken is cooking, combine the diced cucumber, halved cherry tomatoes, and red onion in a bowl with lemon juice and fresh parsley.
Remove the chicken from the pan, let it rest for 3 minutes, then slice it into thin strips.
Assemble the bowl by placing the warm cooked brown rice at the base, then topping it with the sliced shawarma chicken and the fresh vegetable salad.