In a bowl, combine the cream cheese, spinach, mozzarella, Parmesan, garlic, Italian seasoning, kosher salt, and black pepper.
4 ounces cream cheese, 5 ounces frozen spinach, 1/4 cup Parmesan cheese, 2 garlic cloves, 1/2 tablespoon Italian seasoning, 1/4 teaspoon kosher salt, dash of fresh black pepper, 1/2 cup mozzarella cheese