Slice zucchini or squash into 1/4 inch-thick rounds. Toss rounds with oil, coating well.
In a wide bowl or plate, combine breadcrumbs, parmesan, salt and pepper.
Place rounds in parmesan-breadcrumb mixture, coating both sides of each round, pressing to adhere. The mixture will not completely cover each round, but provides a light coating on each side.
Place rounds in a single layer on baking sheets. Sprinkle any remaining breadcrumb mixture over the rounds.