Press SAUTE button on Instant Pot, and when it reads hot, add the olive oil and ground beef
Break beef up with wooden spoon or spatula, and cook until no longer pink. Drain fat, if necessary. Add taco seasoning, and stir.
Hit Cancel, and pour in beef broth. Add black beans over beef. (if using) Place lid on pressure cooker, turn vent to Sealing, and hit PRESSURE COOK for 5 minutes
Pot will take a few minutes to reach pressure, then begin counting down and cook for 5 minutes. When pot beeps, turn vent for a quick release or do manual release to keep warm until serving
When pin drops, remove lid, stir meat mixture, and serve. To reduce liquid, hit SAUTE, and cook for 5 minutes or until liquid is reduced