Preheat the oven to 200 degrees Celsius (390 Fahreneheit).
Pierce the sweet potatoes and place them on a large baking tray.
In a bowl, add the chicken breasts, oil, garlic, paprika, salt and pepper, and mix well to coat.
Place the chicken breasts onto an oven-proof dish and transfer to the baking tray to bake at the same time as the sweet potatoes.
After 25-30 minutes check if the chicken is done, depending on the size of the sweet potatoes, they may take longer to cook.
If the chicken is ready, remove from the oven and shred using 2 forks.
Chop the spring onions, add the mozzarella and mix everything with the shredded chicken.
When the sweet potatoes are tender, cut them in half horizontally, but not all the way through, and stuff with the chicken mixture.
Return to the oven for 5-10 minutes so the cheese can melt.
Serve with a dollop of sour cream or Greek yogurt, or just on their own.