Remove the slice from the oven, and let it cool for a few minutes. It will firm up and be easier to cut after it has cooled down a little.
The zucchini slice can be kept for up to 4 days in the fridge in an airtight container in the fridge. The zucchini slice will feed 4 - 6 people if eaten as a main course for lunch or dinner, and 8 people if served as a snack or appetizer.
Freezer Instructions: Wrap the slice pieces individually in plastic wrap, then place in an airtight container or in sealed freezer bags. Keep in the freezer for upto 3 months. To defrost, let the slices thaw at room temperature, or place in the fridge to thaw overnight. If you are adding to kids lunch boxes, frozen zucchini slices can be added to lunchboxes in the morning, and they will thaw by lunch time.