Preheat your grill or oven to medium-high heat (about 400°F).

Thread the zucchini rounds onto skewers, leaving a little space between each piece.

Mix the melted butter, minced garlic, olive oil, salt, and pepper in a small bowl until well combined.

Brush the garlic butter mixture generously onto the zucchini skewers.

Grill or roast the skewers for about 8-10 minutes, turning occasionally, until the zucchini is tender and lightly charred.

Garnish the skewers with the remaining garlic butter, sprinkle chopped parsley on top, and add grated Parmesan cheese if desired.