Wash the potatoes and scrub to get rid of dirt. Peel the potatoes and cut them into equal cubes.
Place the diced potatoes and garlic in an instant pot.
Pour in vegetable broth. Seal the instant pot with the lid tightly and seal the valve.
Select manual cooking at high pressure and cook for about 5 minutes.
After five minutes are up, switch the valve to venting.
Quick-release the pressure.
Open the lid carefully. Add non-dairy butter, cream cheese, and sour cream.
Mash the potatoes using a potato masher until all the ingredients are well combined.
Season with salt and serve.