Preheat the oven to 450 and prepare a baking sheet.
Slice each zucchini into 1/4" slices.
Place sliced zucchini on the baking sheet. Top each piece with a dollop of marinara sauce, a sprinkle of mozzarella cheese, spices, and pepperonis if desired.
Bake for 5 minutes. Then, broil for 3-5 minutes until cheese is melted.