Fill a large pot about ⅔ of the way with cold water, salt, and potatoes. Optionally, add garlic. Bring to a boil.
Cook potatoes uncovered until fork tender, about 15 minutes. Drain thoroughly.
While potatoes are cooking, add butter and milk to a medium saucepan over medium heat. Cook and stir until butter is melted.
Using a potato masher, mash the potatoes up just a bit. Gradually add the butter mixture in while mashing. Mash potatoes until mostly smooth with small bits of potatoes throughout, or smooth depending on preference.
Sprinkle salt and pepper to taste evenly over the mashed potatoes. Using the potato masher, fold the salt and pepper evenly throughout the mashed potatoes.
Transfer to a serving bowl and use a spoon to create swirls. Pour melted butter into swirls. Top with a pats of butter and chives. Enjoy!
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Notes
Storing Instructions: Cool completely, then store mashed potatoes in an airtight container in the refrigerator for 2-3 days.