Preheat your oven to 425°F and line two large sheet pans with parchment paper. Arrange chicken pieces evenly across the pans, leaving space between each piece so they roast rather than steam.

In a small bowl, whisk together olive oil, garlic powder, oregano, basil, salt, and black pepper. Drizzle this herb mixture over the chicken pieces, ensuring every surface gets coated thoroughly with the aromatic blend.

Roast chicken for 15 minutes at 425°F before adding vegetables, allowing the meat to begin cooking and releasing juices. This timing ensures chicken finishes cooking at exactly the right moment as vegetables reach perfect tenderness.

Remove pans from oven and scatter all prepared vegetables around the chicken pieces, nestling them into any open spaces. Pour remaining herb oil over vegetables and toss gently to distribute flavors evenly across the summer potluck sheet pan dinner.

Return to oven and roast for 18-20 minutes until chicken reaches an internal temperature of 165°F and vegetables are tender-crisp with caramelized edges. Cherry tomatoes should burst slightly while zucchini remains firm enough to hold its shape.

Remove from oven and immediately drizzle fresh lemon juice across everything, then sprinkle chopped parsley and grated Parmesan cheese over the top. The residual heat will slightly wilt the fresh parsley while the Parmesan creates a subtle, savory finish.

Let the sheet pan rest for 3 minutes before transferring to a serving platter, allowing juices to redistribute throughout. This brief resting period prevents the delicate vegetables from falling apart during transfer.