Preheat the oven to 425°F (220°C). In a large bowl, combine the chicken chunks, melted butter, garlic, salt, and pepper, mixing well to evenly coat the chicken.
Thread the marinated chicken chunks evenly onto 6 skewers.
Place the skewers on a disposable aluminum baking tray . This way air can circulate around them. Lay fresh rosemary sprigs on top of the chicken pieces.
Bake for about 15 minutes, removing rosemary before flipping halfway through for even browning on all sides.
Once the chicken is cooked through and lightly charred, remove from the oven. Let the chicken cool for 10 minutes. Then serve and enjoy.