Add beef, oil, onion and garlic in the pressure cooker. Saute until meat is brown on all sides and onion is translucent.
Place the lid on the pressure cooker and seal shut. Close the pressure release valve. Set the instant pot to manual, high pressure for 10 minutes.
The brown sugar mixed into the sauce gives this Instant Pot Beef and Broccoli a little bit of a sweet flavor. I think this would be a fun dish to add a little spice to as well. Maybe put some Sriracha sauce on before serving? I love that slightly sweet and spicy combination!