Put the entire squash including the skin into the microwave for a minute or two. This softens it just enough to make peeling and cubing simpler.
Place the chunks of butternut squash into a medium-sized resealable freezer bag. There are two options for assembling this side dish. If you want the Parmesan and breadcrumbs as a topping, you can place the other ingredients into a separate medium-sized freezer bag and staple the bags together. Otherwise, you can place all the ingredients into one bag. Remove the excess air from the bag(s), seal, and freeze.
On the day of cooking, thaw. If you made it all in one bag, place the bag contents into a small, greased oven-safe cooking dish and mix. Bake, covered at 350° for one hour.
If it is in two bags, place the butternut squash in a small, greased baking dish and top with the topping from the other bag. Cover and bake at 350° for one hour.