Turn the Instant pot on to 'saute' add the oil and brown the roast on all sides.
Sprinkle the ranch seasoning packet, the Italian dressing packet and the brown gravy mix packet over the top of the roast.
Add the beef broth (or water)
Place the lid on the pot, place the toggle switch to sealing, and press manual, high pressure for 90 minutes.
Do a Natural Release for 15 minutes and then a Quick Release to release the rest of the pressure in the pot.
Carefully remove the lid.
Remove the roast to a plate to rest
Press the saute function. Make a slurry of the cornstarch and water to thicken the gravy. Add it to the pot and stir until it thickens.
With two forks, begin to shred the beef roast.
Serve the roast over potatoes or rice and drizzle the gravy over the top. Enjoy!
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