Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Slice the chicken breast into thin, bite-sized strips and place them in a mixing bowl.
Toss the chicken with olive oil, lemon juice, oregano, garlic powder, cumin, sea salt, and black pepper until evenly coated.
Spread the chicken strips across the prepared baking sheet in a single layer and roast for 15-18 minutes until the edges are golden and crispy.
While the chicken roasts, place the cauliflower rice in a non-stick skillet over medium heat and sauté for 5-7 minutes until tender and slightly toasted.
Dice the cucumber, halve the cherry tomatoes, and finely mince the red onion.
In a small ramekin, whisk together the Greek yogurt and tahini with a teaspoon of water until smooth and pourable.
Divide the cauliflower rice into a bowl, top with the roasted chicken shawarma and fresh vegetables, then finish with a drizzle of the tahini sauce and fresh parsley.