Wondrous Recall allows caster to restore to memory two already cast spells from their spellbook. Higher level spells will take priority in restoration queue over lower level spells.
Since the spell simply checks the spellbook for used up spells, you can even pick different spells than the ones you've cast, and the Wondrous Recall will still restore them. You can even pick spells during the casting animation.
In-game description Edit
|“|| Wondrous Recall|
This spell enables the caster to bring back to memory 2 spells that have been previously cast. If no spells have been cast yet, nothing happens. Wondrous Recall cannot recall 6th-level or higher spells.