mushroom lasagna

INGREDIENTS

• Salt
• Olive oil
• 3/4 pound dried lasagna noodles
• 1 large clove garlic, minced
• 4 cups whole milk
• 3/4 cup (12 tablespoons or 1 1/2 sticks) unsalted butter, divided
• 1/2 cup all-purpose flour
• 1 teaspoon freshly ground black pepper
• 1 teaspoon ground nutmeg (I used less, because this seemed like a lot)
• 1 1/2 pounds cremini or portobello mushrooms
• 1 cup freshly grated parmesan