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Beat butter on high until soft, about 30 seconds.
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Add sugar. Beat on medium-high until light and fluffy, about 3 minutes.
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Add eggs one at a time, beat for 30 seconds between each.
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Whisk together flour, baking powder, and salt in a bowl. Add to mixer bowl. Add the milk and vanilla. Mix to combine.
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Scoop into cupcake papers about half to two-thirds full (depending on whether you want flat or domed cupcakes).
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Bake for 22-25 minutes until a cake tester comes out clean.