A friend of mine from سطيف (Algeria) says خبز while كسرة means a peculiar kind of flat bread.In some areas the word كسرة (pronounced kisra) may be used
As stated in the second post of this thread, the word for bread in EA is 3eesh. It doesn't have plural as it's more of a collective noun. A loaf of bread is reghiif رغيف and the plural reghefa/erghefa إرغفة - رِغِفة.In a learn Sudanese Arabic book it’s stated that bread is - eesh and plural iyuush , loaf-of bread - eesha or raghiifa and plural raghiif
Not sure if it’s the same in Egypt.