Preheat oven to 400°F and line a large sheet pan with parchment paper.
Arrange chicken breasts on the sheet pan, then scatter the potatoes, broccoli, and carrots around them.
In a small bowl, mix melted butter, garlic, Italian seasoning, salt, and pepper.
Drizzle the butter mixture over the chicken and veggies, tossing gently to coat.
Bake for 25 to 30 minutes until chicken is cooked through and vegetables are tender.
Garnish with fresh parsley before serving.