Pre-heat oven to 375 degrees f.
Heat oil in a large oven-safe skillet over medium-high heat.
Rub the chicken with spices and season with sea salt and pepper then sauté on both sides for about 3 minutes each, until browned but not cooked all the way through.
Set chicken on a plate. Add onions to the skillet and cook for about 3-5 minutes, then add in garlic and cook for 30 seconds more.
Stir in diced tomatoes and combine things well, then return the chicken to the pan, nestling it into the sauce.
Place the skillet in the preheated oven and bake for about 20 minutes or until the chicken is cooked through and no longer pink in the inside.
Garnish with black olives and fresh basil and enjoy!