Cook the potatoes following the stovetop or Instant Pot directions provided below.
Once the potatoes are cooked and drained, transfer them to a large mixing bowl while still hot. Add the butter, sour cream, milk, minced garlic, garlic powder, salt, and pepper.
Mash the potatoes using a potato masher or a hand mixer. For a slightly chunky texture, stop mashing once all ingredients are evenly combined. Be careful not to over-mix, as this can result in gummy potatoes.
Taste the mixture and adjust the seasoning with more salt and pepper if necessary. Serve warm and enjoy this comforting side dish.