Set the Instant Pot to Sauté mode and add the olive oil. Once the oil shimmers, add the diced onions. Sauté for about 3-4 minutes, or until they turn translucent and fragrant.
Stir in the minced garlic and sliced mushrooms. Continue sautéing for an additional 3 minutes, or until the mushrooms have softened and their moisture begins to release.
Incorporate the beef stew meat into the pot. Season generously with salt, pepper, and smoked paprika. Cook for about 5 minutes, turning the meat occasionally until it is browned on all sides.
Pour in the beef broth, Worcestershire sauce, and Dijon mustard. Use a wooden spoon to scrape the bottom of the pot, ensuring that any browned bits are deglazed for added flavor.
Secure the Instant Pot lid and ensure the vent is set to sealing. Switch to Manual mode and cook on high pressure for 20 minutes.
After the cooking time concludes, allow the pressure to release naturally for 10 minutes. Then, carefully perform a quick release to release any remaining pressure.
Open the lid and stir in the egg noodles. Close the lid again and set the Instant Pot to Manual mode for an additional 5 minutes cooking time.
Once the second cooking cycle is complete, use the quick release method to release the pressure. Stir in the sour cream until the mixture is smooth and creamy. Taste and adjust the seasoning with more salt and pepper if desired.
Notes
To serve, ladle the beef stroganoff into shallow bowls and garnish with fresh parsley.