Flash Recall

You've developed the ability to instantly recall an unprepared spell in moments of sudden necessity. As an action, you can instantly prepare a spell from your available class spell list (or spellbook, if you prepare spells from one) that you did not have prepared. This spell choice must be of a level for which you have spell slots. You then lose preparation of a different spell of your choice of equal or higher level.

If you are multiclassed, you can only Flash Recall spells from a class that prepares spells. Once you use this ability, you must finish a short or long rest before you can use it again.

- Matthew Mercer, Tal'Dorei Campaign Setting, Pg. 109