01 - Preheat grill or grill pan to medium-high heat.
02 - Whisk together melted butter, minced garlic, chopped parsley, lemon zest, salt, and black pepper in a small bowl until well combined.
03 - Thread zucchini rounds onto skewers, spacing pieces evenly to promote uniform cooking.
04 - Brush zucchini skewers generously with half the garlic butter mixture, ensuring even coverage.
05 - Place skewers on the preheated grill and cook for 3–4 minutes per side, turning once, until zucchini is tender and shows light char marks.
06 - Remove skewers from grill and immediately brush with remaining garlic butter while hot.
07 - Sprinkle with grated Parmesan cheese if desired and accompany with fresh lemon wedges.