Wash and quarter 5 pounds Yukon Gold potatoes. You do not need to peel them but can if you prefer.
Boil potatoes in enough water to cover potatoes until potatoes are tender (they should start to break apart when poked with a fork). Drain water and return potatoes to the pot.
Add 6 tablespoons butter, 2 cups sour cream, and Adobo seasoning to taste.
Mash with a potato masher or large fork, adding ½ to 1 cup milk as preferred for consistency. If you like very creamy mashed potatoes you can use a mixer to get a good whipped consistency. If you like lumpy potatoes, use a fork or potato masher to maintain a more solid consistency.