In a small bowl, whisk together the cumin, coriander, turmeric, garlic powder, dried oregano, sea salt, and black pepper.
Slice the chicken breast into thin strips and toss with the spice blend until every piece is thoroughly coated.
Heat the olive oil in a large skillet over medium-high heat and sear the chicken until it is golden brown and cooked through.
Transfer the chicken to a plate and add the cauliflower rice to the same skillet, sautéing for 4 minutes until tender.
While the base cooks, finely dice the cucumber, cherry tomatoes, and red onion for the fresh topping.
In a small container, stir the tahini and lemon juice with a teaspoon of warm water until the sauce is smooth and creamy.
Divide the sautéed cauliflower rice into bowls and top with the spiced chicken and the diced vegetable mixture.
Finish the dish by sprinkling with fresh parsley and drizzling the lemon-tahini sauce over the entire bowl.