Preheat the oven to 425°F and line a baking sheet with parchment paper.
In a small bowl, whisk together the olive oil, lemon juice, cumin, coriander, turmeric, garlic powder, salt, and pepper.
Place the chicken breast on the baking sheet and brush both sides thoroughly with the spice marinade.
Roast the chicken for 18 to 20 minutes, or until the internal temperature reaches 165°F.
While the chicken roasts, lightly sauté the cauliflower rice in a non-stick skillet over medium heat until tender.
Dice the cucumber and halve the cherry tomatoes.
Slice the roasted chicken into thin strips across the grain.
Assemble the bowl by layering the cauliflower rice, sliced chicken, cucumber, and tomatoes, then finish with a drizzle of tahini.