Layer the chicken broth, pasta, red onion, fajita seasoning, salt, chicken, and salsa into the Instant Pot. Do not stir. Gently press the pasta into the broth to be sure the pasta is submerged in the liquid.
Close and lock the Instant Pot lid. Be sure that the pressure release valve is set to sealing.
Select manual high pressure, and adjust the cooking time to 4 minutes. It should take about 10 minutes to come to pressure.
When the cooking time has finished, carefully turn the pressure release to venting to perform a quick pressure release.
Add in the peppers, cream, and grated cheese.
Set the lid back on and let stand for about 5-6 minutes, letting the peppers soften and the cheese melt.
Open the lid and give it a good stir. Season with additional fajita seasoning, salt, and pepper if desired.
Serve garnished with fresh cilantro.
Notes
Pasta: Feel free to use another similar shape of pasta if you prefer.
Peppers: I recommend using different colored bell peppers.
Cheese: You can use grated parmesan cheese, Monterey Jack, Cheddar Jack, pepper Jack, or any type of cheese that you like.
Spicy: If you'd like some heat, use hot fajita or taco seasoning and hot salsa.