Season chicken breast with Za'atar, salt, crushed garlic. Let it marinate for 1 hour.
On a hot griddle pan, 1/2 tsp olive oil. Put marinated chicken breast. Let it cook on medium heat for 4-5 minutes. Flip and cook for another 3 minutes.
Let the chicken rest in a blow. Meanwhile in the same pan, in remaining oil add cherry tomatoes and chickpeas. Cook on high heat for 2-3 minutes. the tomatoes should look charred.
Slice chicken to thin strips. ( I reserved the liquid released from the chicken in the same bowl and added to the salad).
In a big mixing bowl add all the greens, cucumber, charred cherry tomatoes, chickpeas, olives, sliced chicken. Add lemon juice. Mix well.
Sprinkle extra Za'atar on top if required.Serve immediately.