📖 Instructions

1. Before you even start peeling, preheat your oven to a good 375°F (190°C). This ensures it’s perfectly hot when your gratin is ready to bake, leading to that lovely golden crust.
2. First things first, let's tackle that butternut squash. Carefully peel it using a sturdy vegetable peeler. Then, slice it in half lengthwise and use a spoon to scoop out all those pesky seeds and stringy bits. Now, here's the fun part: slice the squash into thin, even rounds or half-moons, about 1/4-inch thick. Consistency is key here for even cooking, so take your time! If they're too thick, they won't soften nicely; too thin, and they might burn.
3. Grab a large mixing bowl. Toss those beautiful squash slices with 2 tablespoons of olive oil, 1 teaspoon of salt, 1/2 teaspoon of black pepper, and 1/2 teaspoon of cinnamon. Spread them out in a single layer on two large baking sheets. Don't overcrowd them; give them some space to breathe! Roast in the preheated oven for about 20-25 minutes, flipping halfway through, until the squash is tender and just starting to caramelize around the edges. This step really brings out its natural sweetness. Pull them out and set aside, but keep that oven on!
4. While the squash is roasting, let's whip up that glorious maple cream sauce. In a medium saucepan, melt 2 tablespoons of unsalted butter over medium heat. Whisk in 2 tablespoons of all-purpose flour and cook for 1-2 minutes, stirring constantly, to create a roux. This will thicken our sauce, you know?
5. Slowly, gradually, whisk in 1 1/2 cups of heavy cream and 1/2 cup of chicken or vegetable broth. Keep whisking until the mixture is smooth and lump-free. Bring it to a gentle simmer, then reduce the heat to low. Stir in 1/4 cup of pure maple syrup, 1/4 teaspoon of ground nutmeg, another 1/2 teaspoon of salt, and 1/4 teaspoon of black pepper. Continue to cook, stirring occasionally, for 3-5 minutes, or until the sauce has thickened enough to coat the back of a spoon. Taste it and adjust seasoning if you think it needs a little something extra.
6. Now for the assembly! Lightly grease a 9x13 inch baking dish. Arrange half of your roasted squash slices in a slightly overlapping pattern on the bottom of the dish. Pour about half of the maple cream sauce evenly over the squash. Sprinkle with half of the 1/2 cup of shredded Gruyère cheese and half of the 1/4 cup of chopped pecans.
7. Repeat this layering process with the remaining squash, sauce, cheese, and pecans. Make sure everything is nicely covered and spread out. For that extra special touch, you can lightly press down on the layers to ensure everything is nestled together.
8. Cover the baking dish loosely with aluminum foil and bake for 20 minutes. After 20 minutes, remove the foil and continue baking for another 15-20 minutes, or until the gratin is bubbly, golden brown on top, and the cheese is melted and slightly crispy. If you want even more color, you can pop it under the broiler for a minute or two at the very end, but watch it like a hawk!
9. Once out of the oven, resist the urge to dive in immediately! Let the gratin rest for about 10-15 minutes before serving. This allows the sauce to set a bit and makes for cleaner serving. Garnish with a sprinkle of fresh chopped parsley or sage if you're feeling fancy. Enjoy your beautiful, delicious gratin!