Spray bottom of instant pot with cooking spray. Set to sauté mode and add onions and ground beef. Sauté until beef is fully cooked and onions are tender, approximately 6-8 minutes. Cancel the sauté mode.
Add in beef broth and deglaze the bottom of the pot, removing any of the stuck pieces from the bottom with a wooden spoon. Add in pasta, tomatoes, beans, green chiles and taco seasoning. Stir to combine. Using your wooden spoon, push the pasta down into the broth to be sure it is covered before you seal the lid.
Close the lid and set the pressure release valve to sealing. Cook on manual pressure for 5 minutes. Your instant pot may take up to 20 minutes to reach pressure and start cooking.
Once cooking is complete, use the quick release to vent the pressure and remove the lid.
Add in your cream cheese and taco blend cheese, stir until melted. Taste and see if you need to add any salt or pepper.
Transfer to a serving dish and top with your favorite garnishes.