Combine chicken, vegetables, onion, and garlic in slow cooker.
Pour in chicken broth and heavy cream, stir to combine.
Add softened cream cheese in small pieces.
Season with thyme, parsley, salt, and pepper.
Cover and cook on LOW for 4-6 hours, stirring occasionally if possible.
About 30 minutes before serving, cook egg noodles according to package directions.
Drain noodles and stir into slow cooker with Parmesan cheese.
Let rest 5-10 minutes before serving.