Steam the Potatoes: Place the potato chunks in a steamer basket set over a pot of simmering water. Cover with a lid and steam the potatoes until they are fork-tender, which usually takes about 15-20 minutes depending on the size of the chunks.
Mash the Potatoes: Once the potatoes are cooked through, transfer them to a large mixing bowl. Use a potato masher or a fork to mash the potatoes until they reach your desired consistency. For a smoother texture, you can use a potato ricer or a food mill.
Add Flavorings: Season the mashed potatoes with salt, pepper, and any other desired flavorings such as butter, cream, garlic, or herbs. Mix well to incorporate the seasonings evenly throughout the mash.