Potatoes should be peeled and diced into 1-inch chunks.
To the instant pot, add the potatoes, water, garlic, and salt.
Choose PRESSURE. Cook at HIGH pressure for 6 minutes with the pressure valve sealed.
Quick Release and switch on the pressure cooker.
Start mashing the potatoes with a potato masher after adding the butter.
Optional Step: Add the heavy cream, 1 tablespoon at a time, while whisking the potatoes.
Thus, the mashed potatoes will be much more smooth.
To achieve the correct consistency, add more cream.
Scoop into a bowl, add melted butter, and top with chives or parsley for decoration.