How many ways do we have to fully heal our characters to our max hp in one go? Just any way at all whatsoever?

With so many ways to RAISE our max hp, it doesn't really feel like we ever have enough options to actually get to that max hp once we start taking hits unless the run is going so smoothly that it doesn't even matter what our max hp is roughly.

I know that waffle fully heals us, the relic. What else fully heals us? And I don't mean shit like Ironclad's starting relic who can technically heal up to max over the course of a few fights. I mean all in one go.