Place the sliced mushrooms, diced onion, minced garlic, vegetable broth, Worcestershire sauce, paprika, flour, and cream cheese into the slow cooker.
Stir the ingredients together and season with salt and black pepper.
Cover and cook on low for 6 to 7 hours or on high for 3 to 4 hours until the mushrooms are soft.
Stir in the sour cream until the sauce is smooth.
Cook the egg noodles in a pot of boiling water according to package directions, then drain.
Spoon the mushroom stroganoff over the cooked noodles and sprinkle with fresh parsley before serving.