Select Sauté on the Instant Pot and add the avocado oil.
Add the onion and garlic and sauté for about 3 minutes.
Add the zucchini, potato and frozen mixed vegetables. Sauté for another 5 minutes.
Turn off Sauté. Add the vegetable broth and scrape the bottom of the pot to loosen any stuck-on bits.
Add the stewed tomatoes, diced tomatoes, granulated garlic, rosemary, parsley, thyme, salt, pepper and bay leaves.
Secure the lid and set the steam-release valve to Sealing, if your model requires it. Select Soup and use [your tested cooking time and pressure level].
When cooking finishes, carefully perform a quick release according to your appliance’s instructions. If liquid sputters from the valve, pause the release until it subsides.
Once the pressure has fully released and the float valve drops, open the lid away from your face. Remove the bay leaves, stir, and taste before adjusting the seasoning.