Comforting casserole combining tender acorn squash and sweet apples with a buttery crumb topping. Perfect for holiday dinners and family gatherings.

Preheat oven to 375°F (190°C). Grease a 9x13 inch baking dish.
Peel squash and cut into 1-inch cubes. Peel and slice apples.
In a large bowl, toss squash and apples with ¼ cup brown sugar, cinnamon, nutmeg, salt, and vanilla.
Transfer mixture to prepared baking dish and spread evenly.
For topping, combine flour, oats, remaining brown sugar, and walnuts if using.
Cut in cold butter until mixture resembles coarse crumbs.
Sprinkle topping evenly over squash and apple mixture.
Cover with foil and bake 30 minutes.
Remove foil and bake 20-25 minutes more until topping is golden and squash is tender.
Let rest 10 minutes before serving.
Cut squash and apples into similar sizes for even cooking. You can prep this casserole a day ahead and bake when ready to serve.
Try with pears instead of apples, or add dried cranberries for extra color.
Cover and refrigerate leftovers for up to 4 days. Reheat covered in 350°F oven until warmed through.