Peel and quarter the potatoes and trim the ends off the garlic. Add the potatoes and garlic to a large pot, cover with cold tap water, add in the rosemary sprig, season well with salt and bring to a boil over medium-high heat. Cook the potatoes until tender, 15 to 20 minutes.
Meanwhile, add 1/4 cup of the butter into a small saucepan over medium-low heat and bring to a simmer. Cook the butter, stirring frequently, until golden brown flecks appear and the butter smells nutty. Turn the heat down to low and add in the remaining 1/4 cup butter to melt. Stir in the cream.
Drain the potatoes, remove the sprig of rosemary and return the potatoes and garlic to the pot. Roughly mash with a potato masher, then add the brown butter mixture, buttermilk or sour cream and horseradish. Using a hand mixer, beat the potatoes just until smooth and creamy and season well with salt.
Cover and keep warm over low until ready to serve.
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