Upon breaking fast

Dhahabaẓ-ẓama', wabtallati ‘l-`urūq, wa thabata ‘l-'ajru in shā Allāh. The thirst is gone, the veins are moistened, and the reward is confirmed, if Allah wills. Reference: Abu Dawud 2/306 and others. See also Al- Albani, Sahihul-Jami' As-Saghir 4/209.
Allāhumma innī as'aluka bi raḥmatika ‘l-latī wasi`at kulla shay' an taghfira lī. O Allah, I ask You by Your mercy, which encompasses all things, that You forgive me. Reference: Ibn Majah 1/557 from a supplication of Abdullah bin 'Amr. Al-Hafidh graded it as good in his checking of An-Nawawi's Kitabul-'Athkdr. See Sharhul- Athkar 4/342.