Instant Pot Fiesta Beef and Spaghetti

Using the saute setting on the Instant Pot, preheat the pot, then add the ground beef and taco seasoning, cooking and crumbling the beef until it is fully cooked; drain any fats that accumulate, if needed.
Add the tomato paste to the ground beef mixture and cook for 1 full minutes, stirring often. Top the ground beef mixture with both cans of the diced tomatoes and green chilies, the chicken broth, and the broken spaghetti. DO NOT STIR!!
Still using the saute setting, bring the liquid in the bottom of the Instant Pot to a boil. Turn off the saute setting, then lock the Instant Pot lid into place, making sure the valve is set to the sealing position.
Choose the high pressure setting for 3 minutes, bringing the Instant Pot to full pressure. When the timer sounds, perform a quick release to remove all the pressure from the Instant Pot.
Unlock and remove the Instant Pot lid, giving the contents a gentle stir, then top with the cheeses. Serve at once, garnished with tomatoes, cilantro, sour cream, and tortilla chips, as desired.