Set Instant Pot to sauté and cook garlic and bacon until fat has rendered, about 3 minutes. Add broth and allow the pan to deglaze, about 1-2 minutes. Add potatoes, press cancel, lock on the lid, and set Instant Pot to high pressure for 8 minutes.
Once pressure cooking is complete, use the quick release method to depressurize the pot. Gently smash the potatoes in the pot with a potato masher and sprinkle on 1⁄4 cup of parmesan cheese.
Place potatoes on a serving plate, top with the rest of the parmesan cheese and green onions and serve.
Notes
Optional: For a crispier topping, add the air fryer lid to the Instant Pot and cook for 5-10 minutes at 350º. Or broil the potatoes in your oven to crisp the top.