Hit the saute button and add the oil to the Instant Pot. Add in the onion and garlic and cook until the onion is soft and translucent.
Add the broth, tomatoes, and chicken. Set the manual cook time to 10 minutes on high pressure. Let the pressure release naturally for five minutes, then release remaining pressure.
Remove the chicken, and hit the saute button. Add in the kale and tortellini. Cook for 6-7 minutes, until tortellini is cooked.
While the tortellini cooks, shred the chicken.
Return the chicken to the pot, along with the seasonings.
Serve topped with Parmesan.