Preheat oven to 400°F (200°C) and grease a large rimmed sheet pan with non-stick spray.
In a small bowl, whisk together the melted butter, minced garlic, dried oregano, lemon juice, salt, and pepper.
Place the chicken pieces and quartered potatoes on the sheet pan.
Drizzle half of the garlic butter mixture over the chicken and potatoes, tossing to coat evenly.
Spread the ingredients in a single layer and roast in the oven for 15 minutes.
Remove the pan from the oven, add the broccoli florets, and drizzle with the remaining garlic butter mixture.
Return the pan to the oven and roast for an additional 10 to 12 minutes until the chicken reaches an internal temperature of 165°F (74°C) and the potatoes are tender.
Garnish with fresh parsley and serve immediately or portion into meal prep containers.