Preheat your oven to 400 degrees Fahrenheit. Line a large baking sheet with parchment paper or a silicone baking mat to prevent sticking and ensure easy cleanup after your Christmas meal.
Place the zucchini rounds in a large mixing bowl. Drizzle with olive oil and toss well to ensure every slice is evenly coated. This helps the seasoning stick and ensures the vegetables roast properly.
In a small bowl, whisk together the grated Parmesan cheese, garlic powder, oregano, thyme, salt, and pepper. Sprinkle this mixture over the oiled zucchini and toss again until the cheese and spices are distributed across the rounds.
Place the zucchini slices in a single layer on the prepared baking sheet. Avoid overlapping them so that the air can circulate, which helps them get crispy. Bake for 12 to 15 minutes, or until the cheese is golden brown and the zucchini is tender. For an extra crispy finish, you can broil them for the final 60 seconds.
