Push the saute button on your Instant Pot. While the pot is heating, cube chicken breast into small pieces about 1-2 inches in size.
Once pot is hot, add in butter and cubed chicken. Cook on each side for about 2 minutes. Add in chopped up green bell pepper and saute additional minute.
Add all spices to the chicken and stir. (cajun seasoning, dried basil, lemon pepper, salt, pepper and garlic powder). Click cancel on Instant Pot.
Add in half a box or 8 oz of penne pasta and chicken broth and stir.
Place lid on pot and seal. Push manual and adjust the time to 5 minutes. When timer goes off immediately vent all pressure from the pot.
Open lid and push saute. Add in 1/2 cup heavy cream and stir. Saute for about 1 min to allow sauce to thicken. Garnish with Parmesan cheese.