INGREDIENTS
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1 large butternut squash (about 4 lb) cut into ½-inch pieces
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2 Tbsp extra-virgin olive oil
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Kosher salt and freshly ground pepper
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5¾ cups milk, divided
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2 tsp dried thyme
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7 Tbsp unsalted butter
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7 Tbsp flour
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12 no-boil lasagna noodles
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¾ lb fresh mozzarella, sliced ¼-inch thick