Make mini-stacks of about 20 slices in sequence. Arrange a few stacks at a time into the prepared baking dish in a concentric spiral from the outer edge to the inside, fanning them out a bit so that you can see the top 1/8” of all the slices. “Stand” them up a little, so you can it as many vegetable slices in as possible, but you may still have some leftover veggies. Save the smaller rounds for the center of the dish.