Which appetizer features a melty cheese filling at Outback?

The correct choice highlights the Aussie Cheese Fries as the appetizer that features a melty cheese filling. This dish is notable for its crispy fries topped with a generous portion of warm, melted cheese and is often served with a side of ranch dressing. The combination of textures and flavors makes it a popular choice for guests looking for a delicious and indulgent appetizer.

While the other options do have appealing qualities, they do not specifically center around a melty cheese filling. For example, the Bloomin' Onion is an iconic item that focuses on a whole onion that is battered and fried, showcasing a crunchy texture rather than a cheesy filling. Cheesy Fries do contain cheese, but they are not usually prepared with the same emphasis on melting cheese as seen in the Aussie Cheese Fries. Lastly, the Spinach and Artichoke Dip is a creamy dip that features a blend of ingredients but does not highlight been primarily about melted cheese in the same way the Aussie Cheese Fries do. This distinction confirms that Aussie Cheese Fries is indeed the best match for the question regarding a melty cheese filling.