INGREDIENTS
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12 no-boil lasagna noodles (1/2 lb.)
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1 qt. milk
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1/2 cup unsalted butter
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1/2 cup flour
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About 1 1/2 tsp. kosher salt
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About 1/2 tsp. pepper
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1/2 teaspoon nutmeg
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3 garlic cloves, minced
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3 tablespoons chopped parsley, divided
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1 tablespoon chopped fresh thyme leaves, divided
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About 3 tbsp. olive oil, divided
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2 medium leeks, sliced into thin rings
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1 1/2 pounds portabella mushrooms, sliced
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1/2 pound shiitake mushrooms, stemmed and sliced
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1 cup finely shredded parmesan cheese
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1 cup plus 2 tbsp. coarsely shredded asiago cheese