Place the chicken thighs, sliced mushrooms, onion, and garlic into the slow cooker.
Add the chicken broth, Worcestershire sauce, smoked paprika, dried thyme, salt, and black pepper.
Stir the ingredients to distribute the seasonings evenly.
Cover and cook on low for 6 to 7 hours until the chicken is very tender.
Remove the chicken from the slow cooker, shred it with two forks, and return it to the pot.
Stir in the softened cream cheese until it melts into the sauce.
Add the sour cream and mix until the sauce is smooth and creamy.
Spoon the stroganoff over cooked egg noodles and top with chopped parsley.