Shaikh Bin Baz rahimahullah said:

“…So if he supplicates to himself with some supplications after the remembrance (of the prayer) and after giving salams, then there is no harm in that. However, he begins first after praying the obligatory prayer [saying]:

أستغفر الله ثلاثاً، اللهم أنت السلام ومنك السلام تباركت يا ذا الجلال والإكرام

“I seek forgiveness of Allah” [three times]

“O Allah, You are the Grantor of security, and security comes from You. You are Blessing, O You Who have majesty and nobility”

Then he remembers Allah saying:

لا إله إلا الله وحده لا شريك له، له الملك وله الحمد وهو على كل شيء قدير، لا حول ولا قوة إلا بالله، لا إله إلا الله، ولا نعبد إلا إياه له النعمة وله الفضل وله الثناء الحسن، لا إله إلا الله مخلصين له الدين ولو كره الكافرون، اللهم لا مانع لما أعطيت ولا معطي لما منعت، ولا ينفع ذا الجد منك الجد،

There is no true god except Allah; He is One. To Him belongs the dominion and to Him is all praise, and He is Powerful over all things. There is no power and might except with (the help of) Allah. There is no God but Allah and we worship none except Him, to Him belongs the bounty and to Him belongs the grace, and to Him belongs all excellent praise; there is no deity but Allah. We reserve our devotion exclusively for Him though the disbelievers may detest it. O Allah! None can deny that which You bestow and none can bestow that which You hold back; and the greatness of the great will be of no avail to them against You

So if he supplicates after this with what is easy, then all of it is good. There is no blame in that and all praise is due to Allah”

[Reference]

Translated by

Faisal Ibn Abdul Qaadir Ibn Hassan
Abu Sulaymaan