Heat oil in a pressure cooker such as an Instant Pot using the saute function on the normal setting. Add impossible sausage and mash while sauteing for about 3 minutes. We want the sausage in rough chunks and slightly browned. Then stir in shallot and garlic; cook until softened and translucent, about 3 minutes.
Stir in Italian seasoning, pepper, and red pepper flakes if using. Add potato cubes and no-chicken broth. Close and lock the lid. Select high pressure for 5 minutes. Once the timer beeps, release pressure valve.
Open the pot and stir in cashew cream and kale. The kale will soften in about a minute, then divvy portions into soup bowls. Enjoy!