In a large pot, add potatoes and cover them with cold water, ensuring at least an inch of water over them. Season with salt.
Bring the water to a boil, and continue cooking for 15 to 20 minutes or until the potatoes are tender. Test them with a fork.
Drain the potatoes, reserving a bit of the cooking liquid. Return the potatoes to the pot and add salt, butter, garlic powder, and black pepper.
Mash the potatoes until they are consistent and smooth while gradually adding in the reserved liquid until you achieve the desired consistency. Be careful not to add too much liquid, which can make the mashed potatoes runny.
When ready to serve, top your mashed potatoes with fresh chopped chives.