أحسن الله إليكم، Should we blow into our hands after reciting the three Quls 3x as part of the morning and evening adhkār, or is blowing into the hands only prescribed when reciting them before sleep? جزاكم الله خيرًا

Blowing into the hands is prescribed for before sleep, not as part of the morning and evening adhkar. What is established in the authentic Sunnah is that the Prophet ﷺ, when he went to his bed, would recite the three Quls into his hands and then wipe them over his head, face, and body (agreed upon), and this is tied to sleeping.