أَفْطَرَ عِنْدَكُمُ الصَّائِمُونَ وَأَكَلَ طَعَامَكُمُ الأَبْرَارُ ، وَصَلَّتْ عَلَيْكُمُ الْمَلائِكَةُ
Translation 
"May the fasting (people) break their fast in your home, and may the dutiful and pious eat your food, and may the angels send prayers upon you."
Note:
This dua is not only specific to breaking the fast, but can be addressed at any time to the host when eating his or her food (as mentioned in The etiquettes of marriage by Al-Albani)
Note:
This dua is not only specific to breaking the fast, but can be addressed at any time to the host when eating his or her food (as mentioned in The etiquettes of marriage by Al-Albani)
Transliteration
afṭara ‛indakum-uṣ-ṣaa’imoona wa akala ṭa‛aamakum-ul-abraaru, wa ṣallat ‛alaykum-ul-malaa’ikah
