You can substitute sweet potatoes for the butternut squash if you prefer.
For a heartier casserole, add cooked ground beef, ground turkey, or pork sausage.
Dice the squash in similar sizes so they squash cooks evenly.
Use prepped squash (already peeled, diced) that you find in the produce section to save time.
Buy fresh or raw kale. Be sure to chop the leaves into bite size sections and remove the thick stems.
Substitute cracker crumbs or regular breadcrumbs instead of panko.
Feel free to change the cheese from parmesan to Gruyere or even mozzarella.
This casserole recipe is great for using up leftover roasted butternut squash.