HADEES:

Hazrat Abu Sa’eed Khudri t reported that the Holy Prophet r would read the following dua after he had completed his meal:

اَ لْحَمْدُ للهِ الَّذِىْ اَطْعَمَنَا وَسَقَاناَ وَجَعَلَناَ مِنَ الْمُسْلِمِيْنَ ط
Alhumdu lil laahil Lazee At’amana Wa Saqaana Wa Ja’alana Minal Muslimeen

All Praise is due to Al’laah, who has blessed us with food and drink and made us from amongst the Believers (Muslims) (Abu Dawood Pg.573)