5lbsrusset potatoes, peeled and cut into 1 inch cubes
12tablespoonunsalted butter (1 ½ sticks)
1cupwhole milk, at room temperature
4sprigsfresh rosemary + more for topping
6garlic cloves, peeled and smashed
½cupsour cream, at room temperature
2teaspoonsea salt
⅛teaspoonblack pepper
Instructions
Place the potatoes into a large stockpot and cover with salted cold water. Bring the potatoes to a gentle boil and cook for 15-20 minutes or until tender. Drain the potatoes and add back to pot or large mixing bowl.
Meanwhile, add the butter, milk, garlic and rosemary to a medium saucepan. Bring to boil and then reduce to simmer for 15 minutes. Remove the rosemary sprigs.
Add the rosemary infused milk, sour cream, salt and black pepper and mash the potatoes. After slightly mashed, beat with an electric mixer on medium speed until smooth and fluffy.
Transfer the mashed potatoes to a serving dish. Top with some additional chopped rosemary.
Notes
Start the potatoes in cold water, add salt, bring to boil and then reduce to simmer. If you start in hot water, the potatoes will cook unevenly.
Drain the potatoes well to avoid a mushy, watery mess.
Don't skip infusing the milk with rosemary by heating it gently with rosemary sprigs before adding it to the potatoes. This enhances the rosemary flavor.
Mash the potatoes while they're still hot and dry. This helps prevent them from becoming gummy.
Do not overwork the potatoes. You want to mash/whip until just light and fluffy.