Press “sauté” and add onion and garlic in an instant pot, stir frequently until onion is translucent.
Add tomatoes, tomato paste, basil, chicken, chicken broth, salt and pepper and stir the contents.
Cover with the lid and seal the valve.
Cook for 15 minutes on manual “high” pressure.
Release the pressure naturally.
Take out the chicken and put it on the cutting board. Cut into bite size pieces and again put it back into the instant pot.
Add tortellini, cheese, half and half and spinach.
Press sauté and quickly heat up the tortellini.