Produce one photograph in which it can be seen that something has happened. As a suggestion, include in the photograph something that has been either broken, or emptied.
For this, while the brief said one image, I actually took four different ones and decided that I wanted to put both of these in.
Image 1 is of broken eggs within the cake mix, with the action being that the eggs have been broken into the bowl.
Image 2 is the empty and broken egg shells in an empty eggbox, showing that they’ve been broken and used up.