Heat the oil in a heavy large skillet over medium-high heat. Add the squash and toss to coat. Sprinkle with salt and pepper. Pour the water into the skillet and then cover and simmer over medium heat until the squash is tender, stirring occasionally, about 20 minutes. Cool slightly and then transfer the squash to a food processor. Add the amaretti cookies and blend until smooth. Season the squash puree, to taste, with more salt and pepper.
Melt the butter in a heavy medium-size saucepan over medium heat. Add the flour and whisk for 1 minute. Gradually whisk in the milk. Bring to a boil over medium-high heat. Reduce the heat to medium and simmer until the sauce thickens slightly, whisking often, about 5 minutes. Whisk in the nutmeg. Cool slightly. Transfer half of the sauce to a blender*. Add the basil and blend until smooth. Return the basil sauce to the sauce in the pan and stir to blend. Season the sauce with salt and pepper, to taste.
Position the rack in the center of the oven and preheat to 375 degrees F.
Lightly butter a 13 by 9 by 2-inch glass baking dish. Spread 3/4 cup of the sauce over the prepared baking dish. Arrange 3 lasagna noodles on the bottom of the pan. Spread 1/3 of the squash puree over the noodles. Sprinkle with 1/2 cup of mozzarella cheese. Drizzle 1/2 cup of sauce over the noodles. Repeat layering 3 more times.
Tightly cover the baking dish with foil and bake the lasagna for 40 minutes. Sprinkle the remaining mozzarella and Parmesan cheeses over the lasagna. Continue baking uncovered until the sauce bubbles and the top is golden, 15 minutes longer. Let the lasagna stand for 15 minutes before serving.
*When blending hot liquids: Remove liquid from the heat and allow to cool for at least 5 minutes. Transfer liquid to a blender or food processor and fill it no more than halfway. If using a blender, release one corner of the lid. This prevents the vacuum effect that creates heat explosions. Place a towel over the top of the machine, pulse a few times then process on high speed until smooth.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	346.59 Kcal (1451 kJ)
Calories from fat	148.83 Kcal
		% Daily Value*
Total Fat	16.54g	25%
Cholesterol	48.68mg	16%
Sodium	334.17mg	14%
Potassium	604.18mg	13%
Total Carbs	35.99g	12%
Sugars	9.06g	36%
Dietary Fiber	2.44g	10%
Protein	14.18g	28%
Vitamin C	23.8mg	40%
Vitamin A	1.2mg	40%
Iron	1.2mg	7%
Calcium	411.6mg	41%

Amount Per 100 g
Calories	47.01 Kcal (197 kJ)
Calories from fat	20.19 Kcal
		% Daily Value*
Total Fat	2.24g	25%
Cholesterol	6.6mg	16%
Sodium	45.32mg	14%
Potassium	81.94mg	13%
Total Carbs	4.88g	12%
Sugars	1.23g	36%
Dietary Fiber	0.33g	10%
Protein	1.92g	28%
Vitamin C	3.2mg	40%
Vitamin A	0.2mg	40%
Iron	0.2mg	7%
Calcium	55.8mg	41%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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