In a small bowl, whisk together the olive oil, half of the lemon juice, minced garlic, cumin, coriander, paprika, turmeric, cinnamon, sea salt, and black pepper.
Slice the chicken breast into thin strips and toss with the spice marinade until evenly coated.
Heat a non-stick skillet over medium-high heat and cook the chicken for 6-8 minutes, turning occasionally, until golden brown and cooked through.
While the chicken cooks, dice the cucumber and red onion, and halve the cherry tomatoes.
In a small ramekin, stir together the Greek yogurt, tahini, and the remaining lemon juice until smooth.
Place the warm cooked brown rice in a bowl and top with the spiced chicken, cucumber, tomatoes, and red onion.
Drizzle the yogurt-tahini sauce over the bowl and garnish with freshly chopped parsley before serving.