Slice zucchini into very thin disks using a mandolin or sharp knife. Place the zucchini slices in a medium sized bowl.
In small food processor (or with a mortar and pestle), lightly crush the fennel seeds
Then add the remaining spices to your small food processor, and process until well combined. (or just mix all the spices together in a small bowl)
Sprinkle the spices over the zucchini, and toss until the zucchini is well coated on each side.
Cover the bowl, and place in the refrigerator for 30 min to an hour.
When ready to make your pizza, remove the zucchini slices and arrange the slices on top of the pizza and bake.