Add liquids and pasta: Pour in the chicken broth and deglaze the pot. Add the basil, garlic powder, Italian seasoning, milk, pasta, and the seared chicken breasts. Stir well to combine.
Pressure cook: Secure the lid and set the valve to Sealing. Cook on High Pressure for 5 minutes. Once done, perform a controlled quick release — open the valve slightly, pausing if liquid sprays out.
Finish the sauce: Remove the chicken and tent it with foil. Add the cream cheese to the pot and stir until melted and smooth. Mix in the Parmesan cheese, sun-dried tomatoes, and spinach until wilted. Adjust seasoning with salt and pepper.
Combine and serve: Slice or cube the chicken, return it to the pot, and stir to coat with sauce. The sauce will thicken slightly as it cools. Serve warm with extra Parmesan on top, if desired.
Notes
Pair with a green salad and garlic bread; great for weeknight dinners.