Brown the ground beef in the butter.
Meanwhile, mince the onion.
Add the onion in with the ground beef.
Once the ground beef is browned, add in the rest of your ingredients.
Put the cover on your Instant Pot, and set it to cook for 10-15 minutes.
Once it's cooked, let it rest and naturally release pressure.
Serve with sour cream, shredded cheddar, and whatever else your heart desires. Enjoy!