Preheat your oven to broil (500 degrees).

Using a large skillet over medium high heat, heat the olive oil. Working in batches, add zucchini and cook for about 1-2 minutes on each side, or until nicely golden brown. Season with salt and pepper.

Place zucchini rounds onto a lined baking sheet. Top each one with the marinara sauce, a single pepperoni (if desired) and the shredded mozzarella cheese.

Place into oven and cook until the cheese has melted, only for about 1-2 minutes! Remove from the oven. Garnish with fresh parsley and enjoy!