Add the olive oil, salt, pepper, minced garlic, and chopped parsley. Mix well to coat the zucchini slices evenly.
Arrange the zucchini slices on a baking sheet, making sure they are in a single layer for even roasting.
Sprinkle the Parmesan cheese on top of each zucchini slice.
Bake for 20 to 25 minutes, until the zucchinis are golden and the cheese has turned golden. Keep an eye on them to keep them from burning.
Remove from the oven and serve warm.
Notes
Choose smaller zucchini when possible. Smaller zucchini usually have fewer seeds and firmer flesh, which helps them roast better without turning watery.Pat the zucchini dry if it looks very moist. Zucchini naturally holds a lot of water. If the slices look wet after cutting, a quick pat with a paper towel can help them roast instead of steaming.Use freshly grated Parmesan if you can. Freshly grated cheese melts and browns more evenly than pre-shredded varieties, which often contain anti-caking agents that slow browning.