01 - Preheat your grill to medium-high heat, approximately 400°F.
02 - In a large bowl, toss the zucchini slices with olive oil, sea salt, black pepper, and garlic powder until evenly coated.
03 - Arrange the zucchini slices in a single layer on the hot grill. Cook for 4 to 5 minutes per side until distinct grill marks form and the zucchini is tender but still firm.
04 - Remove the zucchini from the grill using tongs and immediately transfer to a serving platter.
05 - While the zucchini is still hot, sprinkle evenly with grated Parmesan cheese so it begins to soften and melt slightly from the residual heat.
06 - Top generously with chopped fresh basil, parsley, and chives.
07 - Serve immediately while warm, or allow to cool to room temperature.