Add the oil and onion to your Instant Pot and press the "sauté" button. Cook for 3-4 minutes.
Stir in the garlic and ground beef. Continue sautéing, stirring occasionally, until the beef is browned (about 5 minutes). If there's a lot of excess fat, spoon it out (I didn't find it necessary).
Add the remaining ingredients (except for salt & pepper) to your Instant Pot.
Close the lid, make sure the valve is on "sealing", and set the timer to cook on high pressure for 8 minutes. The IP will be quite full, so it'll take about 15 minutes for it to get up to pressure.
Once the countdown has finished, do a quick pressure release.
Season with salt & pepper as needed and serve.
Notes
The soup gets quite close to the max fill line in my 6-quart Instant Pot, so be mindful not to stray too far from listed ingredient quantities (but a little over a pound of ground beef should be fine - you don't need to be exact).
Inactive time indicates the time it takes the IP to get up to pressure and release pressure.
Stovetop: Follow steps 1-3 using a regular pot. Bring soup to a boil then simmer with lid slightly ajar for 15-20 minutes or until veggies are tender.
Nutritional information is provided as a courtesy only and should be construed as an estimate rather than a guarantee. Ingredients can vary and Salt & Lavender makes no guarantees to the accuracy of this information.