In a small bowl, mix the olive oil, water, lemon juice, cumin, paprika, allspice, garlic powder, turmeric, salt, cinnamon, cayenne and black pepper.
On a sheet pan lined with aluminum foil or parchment paper, place the chicken, onion, bell pepper and cherry tomatoes.
Drizzle the chicken and vegetables with the spice mixture and toss well to combine.
Bake for 15 to 20 minutes or until the chicken is cooked through and no longer pink. Remove from the oven. Garnish with chopped parsley (optional) and serve.