In a large bowl, combine the halved baby potatoes, cheddar cheese, sour cream, cream of chicken soup, green onions, garlic powder, onion powder, salt, and pepper. Mix well until all the potatoes are coated.
Transfer the potato mixture to a greased slow cooker. Spread it out evenly.
Cover and cook on low for 6 to 7 hours or on high for 3 to 4 hours, until the potatoes are tender.
About 15 minutes before serving, sprinkle the shredded mozzarella cheese on top. Cover and let it melt.
Once the cheese is melted and bubbly, stir gently before serving.