When the pot has finished cooking, turn it off and let the pressure return to normal naturally, about 20 minutes Unlatch the lid and open the cooker. Remove and discard the paper towel. Use hot pads or silicone baking mitts to transfer the (hot!) pan to a nearby wire rack. Cool for 10 minutes, then set a serving plate or platter over the top of the pan. Invert everything, remove the pan, and cool the cake on the plate for at least another 15 minutes before slicing and serving. Or cool to room temperature and store on the counter, loosely covered, for up to 8 hours.