Turn on the sauté setting of the instant pot and pour in the olive oil. Cook the stew meat in batches until browned on all sides. Using a pair of tongs, extract the meat from the Instant Pot and position it on a plate.
Sauté the onion, mushrooms, and garlic until they are nearly tender.
Put the stew meat back into the instant pot and dust it with flour. Cook until the flour turns brown and coats the mixture.
Pour in the beef broth and Worcestershire sauce. Before cooking with the Instant Pot, make sure to securely place and seal the lid. Next, choose the high-pressure option and set the timer for 12 minutes.
Release the pressure manually and take off the lid with caution. Put in the egg noodles and mix thoroughly. Securely cover the instant pot and cook for 3 minutes.
Mix in the sour cream to the pot and adjust the seasoning with salt and pepper as per your taste. Stir well. Top with parsley for garnish and serve.