Add broth and cover and cook on low for at least 8 hours or until roast is fall apart fork tender
Shred beef and add cornstarch slurry, noodles and cream to slow cooker
Turn to high heat and cover and allow to cook for another 30-40 minutes, stirring a few times, until noodles are cooked and sauce is thick.
I don't recommend cooking this recipe on high heat except for the final portion to cook the noodles.If noodles are not done or sauce is too thick, additional broth can be added, ½ cup at a time.To make in Instant Pot:
Add the beef, seasoning and broth to the Instant Pot and cook on high pressure for 75 minutes
Allow the pressure to release naturally then stir in the cornstarch mixture and cream and allow to thicken