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Heat oven to 375 degrees F. Spray a roasting pan with non-stick cooking spray.
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Add the butternut squash onto the tray and toss with olive oil, sage leaves, salt and pepper.
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Roast for 25-30 minutes, until the squash is tender.
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Remove from oven and mash gently with a potato masher or two forks.
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(I actually used a pastry blender and it worked great!)
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While the squash is roasting, make the sauce.
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Melt the butter over medium heat.
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Gently stir in the flour with a whisk.
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Add salt, pepper, nutmeg and dried sage and cook 1 minute, stirring constantly.
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Slowly whisk in milk and cook over medium-high heat, stirring frequently, until sauce boils and thickens slightly.
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Continue to stir constantly while the sauce boils for 1 minute.
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Whisk in the Parmesan cheese and remove the pan from the heat.
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For the assembly of the lasagna: Heat 2 tablespoons olive oil in a large Dutch oven over medium low heat.
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Add onion and salt, cover and cook 20 minutes, stirring frequently, until the onions are brown, fragrant and tender.
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Stir in the spinach and cook for 6-7 minutes more.
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Add the butternut squash and stir until combined.
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Mix in the vegetable stock.
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Remove from heat.
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Spray a 9x13 baking dish with non-stick cooking spray.
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Ladle a small amount of the white sauce into the bottom.
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Arrange 4 lasagna noodles on top of the sauce, overlapping if needed.
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Top with the squash mixture and pour about 1 cup of the white sauce over the squash and arrange another 4 lasagna noodles and repeat these layers 2 more times.
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Top with mozzarella cheese and sage leaves.
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Bake at 375 degrees F, covered with foil, for 45 minutes.
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And then bake another 5-10 uncovered until the cheese is browned.
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Cassies Notes: Sage leaves are wonderful fried.
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Heat 1-2 teaspoons of olive oil in a small skillet over medium-high heat.
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Add 10-15 sage leaves and allow them to crisp for several minutes.
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They are delicious!
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This is a great prep-ahead meal.
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31
I put it together on a Sunday afternoon but didnt bake it until Tuesday night.
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Prepare the lasagna, including layering the pan.
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Cover tightly with aluminum foil and refrigerate for up to three days.
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34
It would also freeze well.
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Just cover tightly with plastic wrap and then with aluminum foil.