Date-filled kahk biscuits is worth adding because it feels like something you actually noticed while travelling through Egypt, rather than a generic souvenir. Biscuits and dry breads are good because they survive the journey and are easy to share at work or with family. I would look for it in a proper local supermarket, covered market, deli, pharmacy, gift shop or small producer rather than leaving it until the departure gate. Back in the UK, it is worth checking specialist shops first because they often stock a better version than a broad marketplace listing. The ideal version is modestly priced, not too bulky, and good enough that you would buy it again even without the holiday memory.