Heat olive oil in a skillet, sauté onion and garlic until softened.
Add diced chicken and cook until lightly browned.
Transfer to crockpot. Add mushrooms, broth, Alfredo sauce, Italian seasoning, salt, and pepper.
Cover and cook on low for 6 hours or high for 3 hours.
Add broken lasagna noodles and heavy cream. Stir and cook for another 30 minutes until noodles are tender.
Serve hot, topped with Parmesan cheese and parsley.