01 - Preheat grill or grill pan to medium-high heat, reaching approximately 400°F.
02 - Combine zucchini slices with olive oil, sea salt, black pepper, and garlic powder in a large bowl, ensuring even coating.
03 - Arrange zucchini rounds in a single layer on the hot grill. Cook for 4 to 5 minutes per side, until charred with grill marks and just tender.
04 - Transfer grilled zucchini immediately to a serving platter.
05 - While zucchini is still hot, sprinkle evenly with grated Parmesan so it softens and melts lightly.
06 - Scatter chopped basil, parsley, and chives over the top.
07 - Serve the zucchini warm or at room temperature for optimal flavor and texture.