In a small bowl, whisk together the ground cumin, coriander, turmeric, garlic powder, sea salt, and black pepper to create the shawarma spice rub.
Coat the chicken breast evenly with the spice blend and half of the lemon juice.
Heat the extra virgin olive oil in a skillet over medium-high heat and sear the chicken for 6-7 minutes per side until golden brown and cooked through.
While the chicken is cooking, dice the cucumber and red onion, and halve the cherry tomatoes.
Whisk the tahini with the remaining lemon juice and a splash of warm water in a small ramekin until the consistency is creamy and pourable.
Place the cooked quinoa in the base of a bowl and top with the diced cucumber, tomatoes, and red onion.
Slice the cooked chicken into thin strips and arrange them over the grain and vegetable base.
Drizzle the creamy tahini dressing over the entire bowl and garnish with freshly chopped parsley.