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Add the sherry or Madeira and brandy and beat on low speed until incorporated, then beat on medium-high speed until the mixture is smooth and fluffy, 1 to 2 minutes.
NPR: Two Centuries of 'Baking in America'
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Working with a stand mixer, preferably fitted with a paddle attachment, or with a hand mixer in a large bowl, beat the butter and sugar together at medium speed for 3 minutes, until very smooth.
NPR: Holiday Sweets: On the Road (and in the Mail)
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For the dough, beat the room-temperature butter in a medium bowl with an electric mixer on medium speed until smooth.
NPR: Two Centuries of 'Baking in America'
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Add the eggs and continue to beat, scraping down the bowl as needed, for another 2 minutes, or until the mixture is light, smooth and creamy.
NPR: Holiday Sweets: On the Road (and in the Mail)