Slice the chicken breast into thin, bite-sized strips and place them in a bowl.
Toss the chicken with the ground cumin, coriander, turmeric, smoked paprika, sea salt, black pepper, and minced garlic until evenly coated.
Heat the olive oil in a large skillet over medium-high heat. Once hot, add the chicken and sear for 5-7 minutes until golden brown and cooked through.
While the chicken cooks, prepare the salad by dicing the cucumber, tomatoes, and red onion. Toss them in a small bowl with half of the lemon juice and the chopped fresh parsley.
In a small ramekin, whisk together the tahini, the remaining lemon juice, and a teaspoon of warm water until the sauce reaches a smooth, drizzlable consistency.
Place the warm cooked quinoa in a serving bowl, then top with the crispy shawarma chicken and the fresh vegetable salad.
Drizzle the lemon-tahini sauce over the entire bowl and enjoy immediately.