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Preheat oven to 400 F.
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For squash and garlic: Lay cubed squash on a rimmed baking sheet, and drizzle with a bit of olive oil (only about 1-2 teaspoons).
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Use your hands to coat the squash with olive oil, then sprinkle with 1/2 teaspoon each of salt and pepper.
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Wrap the 6 cloves of garlic in tin foil and before you seal up the foil drizzle the garlic with 1/2 teaspoon olive oil, salt and pepper.
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Place the closed foil packet on the baking sheet with squash.
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Roast for 50 minutes, tossing every 15 minutes or so.
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Remove from oven and sprinkle the squash with the chopped sage.
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Transfer the squash to a bowl and either mash it with a fork or whip it with a mixer.
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Take the roasted garlic and squeeze the garlic out of its skin into a small bowl.
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Mash garlic with a fork and combine with the 5 tablespoons of butter.
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Mix the roasted garlic butter with the squash, making sure the filling is spreadable.
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Bechamel: Melt the 4 tablespoons butter in a medium saucepan over medium heat.
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Then add the flour, and whisk until smooth.
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Cook over medium heat, stirring regularly, until the mixture turns golden brown, about 6 to 7 minutes.
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Add the milk to the butter mixture, 1 cup at a time, whisking continuously until the sauce is very smooth.
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Bring to a boil and cook for 30 seconds longer.
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Remove from the heat and season with salt and nutmeg.
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Stir in the mascarpone, 1/2 cup of mozzarella and 1/2 cup of Parmesan, whisking until all the cheese is melted and smooth.
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Assembly: Preheat the oven to 375 F. Brush a 9-by-13-inch glass baking dish with melted butter or oil, and layer in the following order from the bottom: about 1/3 of the bechamel, cover with a few sheets of cooked pasta, 1/3 of the squash filling, 6 pepperoni slices and sprinkle with a third of the remaining cheese.
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Repeat these layers 1 or 2 more times.
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I like the very top layer to be just the bechamel, cheese, and pepperoni slices.
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Then if desired top with 6-8 whole sage leaves.
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They with get brown and crispy in the oven.
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Cover with a sheet of foil and bake in the oven for 45 minutes.
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Uncover and bake another 15 minutes or until the top is golden brown and the casserole is bubbling.
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Remove from the oven, allow to cool for 20 minutes, slice, and serve.