Cook the egg noodles on the stovetop according to package instructions while the meat’s cooking and strain and set aside (Note: you can also do this during Step 7 while the Stroganoff is pressure cooking, but just make sure you do it separately on the stove and don’t add the noodles directly into the pot while pressure cooking or they will absorb too much of the liquid and will become mushy).

Season the meat with the kosher salt & pepper (about 1-2 tsp of each should be fine) and rub it in well.

Add the olive oil and butter to the Instant Pot and hit Sauté and Adjust so it’s on the More or High setting. After about 3 minutes (and once the butter’s melted and oil’s bubbling), add in the meat and sear on all sides so it’s lightly browned (about 2-3 minutes total; the meat shouldn’t be fully cooked at all). Remove the meat with a slotted spoon and set aside in a bowl for the time being.

Now, add the onion to the pot with the already heated oil and butter and let cook for 2 minutes and then add the mushrooms and let cook for 3 minutes more. Then, add in the garlic and cook for 1 more minute.

Next, add in the white wine and stir for a minute followed by the dijon mustard and seasoned salt, stir well and deglaze (scrape) the bottom of the pot so nothing’s stuck to it.

Lastly, add in the beef broth and thyme and stir well followed by adding back in the browned beef

Secure the lid, hit the Cancel button followed by the Manual or Pressure Cook button High Pressure for 20 minutes. When done, allow a 10-minute natural release followed by a quick release.

When the lid comes off, hit the Keep Warm/Cancel button and then hit Sautéagain and adjust so it’s on the More or High setting. Bring the pot to a bubble and add in the cornstarch slurry and stir immediately. Then, add in the onion mix packet and let bubble for a minute and then turn the pot to Keep Warm so that the bubbles die down.

Once the bubbles have mostly subsided, add in the sour cream and Boursin. Stir well until they are both totally melded into the sauce and it will be ready!

Place some noodles in individual bowls and then follow with some the beef and plenty of sauce.