To prepare meatballs: Combine ground chicken (or turkey), egg, Parmesan, breadcrumbs, basil, oregano, garlic powder and salt in a medium bowl. Pat 1 tablespoon of the seasoned meat into a disk and place a mozzarella ball in the center. Wrap the meat around the cheese and roll into a ball. Repeat with the remaining meat and cheese. Add the meatballs to the slow cooker.