According to Montakhab al Hasani it is recommended to pray immediately after Magrib prayer(before Isha prayer)
offer 2 rakat salat in each rakat after Surah al Hamd recite 7 times Sura Ikhlass.
After salam read this dua 21 times and do not talk to anyone until recitation is completed
اَللهُمَّ اِنَّكَ عَظِيْمٌ ذُوْ اَناَةٍ وَلَا طَاقَةَ لَنَا لِحُكْمِكَ يَا اللهُ يَا اللهُ يَا اللهُ اَلْاَمَان اَلْاَمَان اَلْاَمَان
Allaahumma Innak A’zeemun D’u Anaatin Wa Laa T’aaqata Lanaa Li—h’ukmika Yaa Allah Yaa Allah Yaa Allah Al —amaan Al —amaan Al —amaan;
O Allah, verily Thou art Sublime, Patient, gives respite, (because) we do not have the capacity to withstand the conditions that take effect under Thy authority. O Allah! O Allah! O Allah! Mercy! Mercy! Mercy!
مِنَ الطَّاعُوْنِ وَالْوَبَآءِوَمَوْتِ فَجَعَةٍ وَسُوْءِ الْقَضَآءٍ وَ شمَتَتِ الْعَادَآءِ رَبَّنَا نَكْشِفْ عَنَّا الْعَذَابَ اِنَّا مُوْمِنُنَ بِرَحْمَتِكَ يَا اَرْحَمَ الرَّاحِمِيْنَ
Minat T’aa--o’on Wal Wabaaa—i Wa Mawti Faja—a’tin Wa Soo—il Qaz”aaa-i Wa Shamatatil Aa’—aaaa—i Rabbanak—shif A’nnal A’x’aaba Innaa Moo—minoona Bi—rah’matika Yaa Arh’amar Rah’imeen
(Safety from the) rampant epidemics, accidental death, evil events, and rejoicing of enemies at (our) misfortune. O our Lord take away from us the pain and torment, truly we believe in Thy Mercy, O the most Merciful!
he following has been narrated on the authority of God‟s Prophet (as),
“Whoever says four units of prayers between the night prayers on the fifteenth night of Sha‟ban, and in each unit he recites Sura Hamd once and Sura Ikhass ten times.( eleven times in another narration.)
Once finished say the following,10 times each
يَا رَبِّ اغْفِرْ لَنَا
Ya Rabb ighfir lana
O Lord! Forgive us‟ ten times,
يَا رَبِّ ارْحَمْنَا
Ya Rabb irhamna
O Lord! Have mercy upon us‟ ten times,
يَا رَبِّ تُبْ عَلَيْنَا
Ya Rabb tub ‘alayna
O Lord! Return to us‟ ten times,
سُبْحَانَ الَّذِي يُحْيِي الْمَوْتَى وَ يُمِيتُ الْأَحْيَاءَ وَ هُوَ عَلى كُلِّ شَيْءٍ قَدِيرٌ
Subhana alladhi yuhyi al-mawta wa yumītu al-ahya’a wa huwa ‘ala kulli shay’in qadeer.
Glory be to Him who gives life and causes to die, and He causes to die what is living and He has power over all things - ten times.
Text, translation and recitation from Duas.org