Using the "sauté" function, heat the olive oil. Add onions and cook until they begin to become translucent.
Add the Italian sausage, crumbling into smaller pieces and cooking until browned.
Add garlic and cook just until fragrant, about a minute.
Drain off excess grease if desired and return to pot.
Add potato slices and chicken broth.
Lock the lid into place and set to "sealed."
Cook at high pressure for 5 minutes using the Manual setting.
When cooking is complete, allow a natural pressure release for 10 minutes, followed by a quick release.
When the pressure valve has dropped, remove the lid and add kale to the pot. The heat from the soup will wilt the kale as you stir.
Pour in cream or half & half, stirring to combine.