Final answer:
For a dinner featuring roasted hard-shell squash with a mild flavor, butternut squash is an appropriate choice due to its sweet, nutty taste and creamy texture when cooked.
Step-by-step explanation:
If you're looking to serve a hard-shell squash with a mild flavor for your dinner, the butternut squash would be an excellent choice. It is known for its sweet, nutty taste similar to a pumpkin, but with a milder flavor. When roasted, butternut squash develops a deliciously rich and creamy texture, making it a favorite in a variety of culinary applications. Other options could include acorn squash or delicata squash, both of which also have hard shells and a mild, sweet flavor profile suitable for roasting.