Creamy White Lasagna Soup with Chicken and Spinach

Ingredients

• 4 tablespoons (56 g) unsalted butter
• 1 medium yellow onion, diced
• 8 oz (225 g) cremini mushrooms, sliced
• 4 cloves garlic, minced
• 1 1/2 teaspoons Italian seasoning
• 1 1/2 teaspoons kosher salt, plus more to taste
• 1/2 teaspoon black pepper
• 3 tablespoons all-purpose flour
• 6 cups (1.4 L) low-sodium chicken broth
• 1 1/4 lb (565 g) boneless skinless chicken breasts
• 8 oz (225 g) dry lasagna noodles, broken into spoon-size pieces
• 4 cups (120 g) baby spinach
• 3/4 cup (180 ml) heavy cream
• 1 cup (115 g) shredded low-moisture mozzarella
• 1/2 cup (50 g) grated parmesan cheese
• 3/4 cup (185 g) whole-milk ricotta cheese, for serving
• 2 tablespoons chopped parsley, optional