Which of the following dishes can be made to-go?

Fingerling potatoes can be made to-go because they are a side dish that is typically served in a way that is conducive to transport. They can be easily packaged in a container without compromising their quality or presentation, allowing customers to enjoy them later.

The other options may not be suitable for to-go orders for various reasons. For instance, pot de crème is a delicate dessert that could be adversely affected by transportation, potentially leading to a loss of texture and quality. Mussels usually need to be served fresh and warm, and packaging them for takeout might not maintain their ideal state. Calamari is often best enjoyed fresh and hot, as it can become soggy or lose its crispiness while in transit. Thus, fingerling potatoes stand out as the best option for takeout among the listed dishes.