Warm the olive oil and butter in a large pot over medium heat.
Soften the onion, carrots, and celery with a pinch of salt for 5–6 minutes, stirring often.
Stir in the garlic and thyme and cook until fragrant, about 30 seconds.
Pour in the broth and bring to a gentle boil.
Add the shredded turkey, reduce heat, and simmer for 10 minutes to meld flavors.
Stir in the egg noodles and cook until tender, 6–8 minutes, stirring once or twice.
Season with salt, pepper, and lemon juice. Adjust to taste.
Fold in the parsley, let the soup rest 2 minutes, then ladle into bowls and serve.