Season with salt and pepper and cook until soft and caramelized.
Cool in the refrigerator for a few minutes.
Combine all other ingredients in with the turkey and add some salt and pepper. You can check the seasoning by taking a small amount of the turkey and browning it in a pan.
Make 2-3 ounce meatballs and put 2 pieces of the bocconcini in the center.
Roll the meatball around and put onto a greased baking tray.
Broil the meatballs in the oven until cooked completely. Should take 5-7 minutes.
If the cheese starts to escape, you know it's done!