Preheat grill or grill pan to medium-high heat.

In a small bowl, whisk together melted butter, minced garlic, chopped parsley, lemon zest, salt, and black pepper until well combined.

Thread zucchini rounds onto skewers, leaving small gaps between pieces to ensure even heat circulation.

Brush zucchini generously with half of the garlic butter mixture, ensuring even coating on all surfaces.

Grill for 3-4 minutes per side, turning once, until zucchini is tender and shows light char marks.

Remove skewers from heat and immediately brush with remaining garlic butter while hot.

Sprinkle with grated Parmesan if desired and accompany with fresh lemon wedges.