In a medium sized bowl, mix together salt, Italian seasoning, paprika, garlic powder, and black pepper.
Add diced chicken to bowl and toss until chicken is full coated in seasonings.
Plug in the Instant Pot and press the SAUTE button. Add 1 Tablespoon of butter and let it heat up. Add the chicken and onion and saute until chicken is seared on all sides.
Cancel the saute function and pour in the chicken broth. Add the pasta and stir, making sure that all pasta is immersed in the broth.
Place the lid on the Instant Pot and secure in place. Turn the vent to SEALING. Press the MANUAL button and set the timer for 4 minutes.
When cooking is finished, move the vent to VENTING and do a QUICK RELEASE of the pressure.
Remove the lid and stir in remaining butter, cream, cream cheese, and Parmesan cheese. If desired, top with fresh basil and serve.