Start the Instant Pot on Saute mode for 30 minutes, that way it will stay on long enough for you to get the meat browned.
Cook the ground beef until almost browned, then add the garlic, onion, celery, and peppers and stir to combine. Cook for 3 minutes.
Add the sausage, diced chilis, and spices, stir to combine. Cook for 3 more minutes.
Add the tomatoes, tomato paste, and beef broth. Stir to combine.
Press cancel to turn off Saute mode. Press Slow Cook to turn on slow cooker mode. Press the Slow Cook button to adjust the setting to Normal or More (the red light will be lit up above the setting that is selected).
If using Normal mode, cook for 6 hours. If using More mode, cook for 4 hours. Leave the vent in the open (venting) position the whole time.
20 minutes before the chili is done, add the beans in and stir to combine so they can warm up.
Top with shredded cheese, sour cream, cilantro, and chips, if desired.
This recipe can be made in the slow cooker. Simply brown the ground beef and vegetables in a pan before adding them, along with all the other ingredients, to the slow cooker. Normal is equivalent to low on most slow cookers and More is equivalent to High on most slow cookers.