Cook the Sausage: In a large saucepan over medium heat, brown the ground sausage.
Add Vegetables: Add chopped onion and sliced mushrooms to the saucepan. Cook for 5-6 minutes until tender.
Add Garlic and Spinach: Stir in minced garlic and baby spinach. Cook for an additional minute.
Simmer with Broth: Pour in the chicken broth and bring to a simmer. Cook for about 5 minutes.
Add Noodles and Seasoning: Add broken lasagna noodles, oregano, and basil. Bring to a low boil and cook for 10-12 minutes until noodles are tender.
Prepare Alfredo Sauce: In a separate skillet, melt butter over medium-low heat. Whisk in flour and cook for 1 minute. Gradually whisk in milk, cooking until thickened. Stir in Parmesan cheese until smooth.
Combine and Serve: Slowly whisk the Alfredo sauce into the soup mixture. Serve hot.