Preheat the oven to 375F. Butter your gratin or casserole dish.
Put the cooked squash in the bowl of a food processor with the eggs, brown sugar, half and half, and melted butter. Pulse about 25 times, and then run the machine for an additional few seconds to completely puree the mixture. A little texture is ok, don't over-process. Season with the nutmeg, salt, and pepper.
Turn the puree into your gratin dish and spread out evenly.
Blend the topping ingredients together in a bowl using your fingers to blend everything together until evenly crumbly. Make sure to break up any clumps of brown sugar. Note: I prefer to do this in my food processor. I first pulse the flour, sugar, and butter together until crumbly, then I add the nuts and pulse a few more times. This results in a very even crumble.
Sprinkle the mixture evenly over the puree.
Bake for about 40-45 minutes. If the topping browns too quickly, cover it loosely with foil. It will be done when you notice it has puffed up very slightly, indicating the souffle-like filling is cooked perfectly. Note: if your topping is browning too quickly lay a loose piece of foil over it.
Notes
To cook butternut squash for this recipe:
Place a large butternut squash, whole, onto a lined baking pan.
Bake at 400F until the flesh in the thickest part can be pierced easily with the tip of a sharp knife. Note that the thickest part of a butternut squash is in the neck, not the 'hollow' bulb end.
Slice the cooked squash in half, scoop out the seeds and stringy bits, and then scrape out the flesh.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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