This is a bit of a fake out. It is a summer squash and it is yellow, but it is not a yellow summer squash. This is really a yellow zuchini. Aside from the color, the texture and size of the seeds is just what you would expect from the dark green variety of zuchini.
Zuchini can be sliced or diced and sauted in oil or butter. It is great grilled in long horizontal slices or in large pieces on a skewer. Cut up, zuchini can make its way into pasta dishes, soups, chilis. Grated it makes a nice moist tea bread. Choose large ones, scoop out the seeds, stuff and bake.
You can do all of the above with the cute little patty pan squashes that were one of you choices.