Preheat oven to 350 degrees F. Spray a 13" x 9" baking pan with olive oil cooking spray.
Place the chicken thighs down the long middle of the baking pan. Place potatoes on one side of the chicken and green beans and carrots on the other side.
Combine the melted butter with the salt, Italian herbs and pepper. Drizzle over the chicken, potatoes and vegetables. Sprinkle with the scallions.
Tightly cover pan with aluminum foil and bake for 1 hour to 1 hour and 15 minutes, or until chicken is done and potatoes and veggies are tender. Serve.