White Lasagna with Spicy Turkey Sausage and 'Shrooms

INGREDIENTS

• 1 cup finely grated Parmesan
• 1 package no-boil lasagna noodles
• 15 ounces whole milk ricotta
• Kosher salt and freshly ground black pepper
• 3 cups whole milk
• 2 small zucchini, finely sliced on the bias (2- to 3-inch pieces)
• 8 ounces shredded mozzarella
• 1 large egg
• 4 tablespoons all-purpose flour
• 2 tablespoons finely chopped fresh flat-leaf parsley
• 1 tablespoon olive oil
• 3 tablespoons unsalted butter
• 3/4 cup sliced button mushrooms
• 3/4 cup finely grated Parmesan
• 2 pounds bulk spicy Italian turkey sausage
• Coarse salt
• 2 teaspoons granulated garlic