Alhamdu lillāhi ‘l-ladhī aṭ`amanī hādhā,
wa razaqanīhi min ghayri ḥawlin minnī wa lā quwwah.
Praise is to Allah Who has given me this food,
and sustained me with it though I was unable to do it and powerless.
Reference:
At-Tirmidhi, Abu Dawud, and Ibn Majah. See also Al-Albani, Sahih
At-Tirmidhi 3/159.