Add the oil to the insert and heat on "Saute - High" mode. Once warmed, saute the beef pieces for 2-3 minutes, browning all sides. Tap "Cancel."
Pour in the beef broth, oyster sauce, soy sauce, sesame oil, ground ginger and brown sugar. Stir and combine with the beef.
Put the lid on and set the valve to Sealing.
Cook on "Manual - High" mode for 5 minutes.
Quick release by moving the valve to release the pressure. Remove the lid.
If you'd like to thicken the sauce, stir the 1 Tbsp of cornstarch with 1 Tbsp of water and make a "slurry." Add the slurry into the sauce in the instant pot insert and stir through. Let the sauce "thicken" on warm mode for about 8 to 10 minutes.
While the sauce is thickening, add the broccoli and let it warm up with the sauce and beef while on warm mode.
Serve Instant Pot Beef & Broccoli with eggrolls and rice.