In a large bowl, combine chopped spinach, cream cheese, shredded mozzarella, sour cream, grated Parmesan, garlic powder, onion powder, salt, and black pepper until smooth and creamy.

Cut the mozzarella string cheese sticks in half, wrap with spinach mixture ensuring complete coverage.

Set up a breading station with flour, beaten eggs, and breadcrumbs. Coat each wrapped stick in flour, dip in eggs, and coat with breadcrumbs.

Heat vegetable oil in a skillet to 350°F (175°C). Use a thermometer for accuracy.

Fry the sticks in batches for 2-3 minutes on each side until golden brown. Drain on paper towels.

Serve warm with marinara sauce or your favorite dipping sauce.