Ibn ‘Abbas reported God’s messenger as saying, “When one of you eats food he should say, ‘O God, bless us in it and give us good nourishment from it', and when he is given a drink of milk he should say, ‘O God, bless us in it and prosper us from it’, for no food or drink satisfies like milk.” Tirmidhi and Abu Dawud transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنِ ابْنِ عَبَّاسٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: " إِذَا أَكَلَ أَحَدُكُمْ طَعَامًا فَلْيَقُلِ: اللَّهُمَّ بَارِكْ لَنَا فِيهِ وَأَطْعِمْنَا خَيْرًا مِنْهُ. وَإِذَا سُقِيَ لَبَنًا فَلْيَقُلِ: اللَّهُمَّ بَارِكْ لَنَا فِيهِ وَزِدْنَا مِنْهُ فَإِنَّهُ لَيْسَ شَيْء يجزى مِنَ الطَّعَامِ وَالشَّرَابِ إِلَّا اللَّبَنُ ". رَوَاهُ التِّرْمِذِيُّ وَأَبُو دَاوُد
sunnah.com