These apparently are very common to potted plants. Leucocoprinus birnbaumii.
They were growing in a potted fig tree. I liked the shape, like a marshmallow, and vivid yellow color. They only lasted for one day and then turned an ugly brown and dried up.
Use the Olympus TG-4 on Microscope mode. Settings were automatic but were 1/400s, f/3.2, ISO 100.