Combine the quartered potatoes and vegetable broth in the instant pot and secure the lid in the sealing position. Set the Instant Pot to steam and set the time for 7 minutes.
While the potatoes cook, heat the dairy-free milk and butter in a small saucepan until just before it simmers. Remove from the heat.
When the instant pot time is up, use the quick release function. After the quick release finishes, remove the lid carefully.
Add the heated milk mixture, salt, pepper, garlic powder, and mash until you reach the desired consistency for mashed potatoes. We like a few chunks!