Preheat the oven to 220°C (425°F).
Place the chicken pieces in a large roasting tin and toss with the olive oil, oregano, salt, and pepper.
Roast for 30 minutes.
Add the butter beans to the tin and continue roasting for another 20-25 minutes, until the chicken is cooked through and the skin is crispy.
Drizzle the melted butter over the chicken and beans before serving.
