You can take a Bonus Action to create an illusory disguise over two creatures within 60 feet of yourself, making it seem as if they have teleported and switched places. The disguise extends to the target's voices, sounds, smells, etc. Disguised creatures don't perceive any part of the illusion.
A creature can take a Study action to examine a magically disguised creature and make an Intelligence (Investigation) check against your spell save DC. On a success, the creature can see both illusory creatures for what they are.
This illusion lasts until the end of your next turn, and it ends early if either disguised creature takes an action that the other can't take (such as casting a spell), if you have the Incapacitated condition, or if you dismiss it (no action required).
You can use this feature a number of times equal to your Charisma modifier (a minimum of once). You regain all expended uses when you finish a Long Rest.