Preheat the oven to 400°F and line a baking sheet with parchment paper.
Lightly spray both sides of the zucchini slices with olive oil and season with salt and pepper.
Place the zucchini slices on the prepared baking sheet and bake for 5 minutes.
Remove from the oven, top each slice with pizza sauce, mozzarella cheese, and a pepperoni slice.
Return to the oven and bake for another 5-7 minutes until cheese is melted and bubbly.
Serve warm and enjoy!