Set instant pot to sauté.
Add the ground sausage to the Instant Pot and cook until it has browned, breaking it up with a spatula as it is cooking.
After the ground sausage has browned, pour in the chicken broth and stir to combine.
Next, add the spaghetti sauce, heavy cream, garlic powder, salt, pepper, and Italian seasoning. Stir until combined.
Add the rigatoni noodles making sure they are submerged into the liquid.
Shut the cover of the Instant Pot and check that the valve is set to "sealing."
Set to pressure cook at high pressure for 6 minutes.
When the timer goes off, do a quick release of the pressure cooker by switching the valve to "venting." When venting has finished, carefully open the lid.
Stir the grated parmesan cheese into the pot until well combined.
Garnish with fresh parsley if desired and enjoy!