Upon completing the meal

Praise is to Allah Who has given me this food, and sustained me with it though I was unable to do it...

Reference:At-Tirmidhi, Abu Dawud, and Ibn Majah. See also Al-Albani, Sahih At-Tirmidhi 3/159.Hisnul Muslim 180

الْحَمْـدُ للهِ الَّذي أَطْعَمَنـي هـذا وَرَزَقَنـيهِ مِنْ غَـيْرِ حَوْلٍ مِنِّي وَلا قُوَّة

Transliteration

Alhamdu lillāhi ‘l-ladhī aṭ`amanī hādhā. wa razaqanīhi min ghayri ḥawlin minnī wa lā quwwah.

Translation

Praise is to Allah Who has given me this food, and sustained me with it though I was unable to do it and powerless.