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Preheat the oven to 350 degrees. Line 13 to 14 muffin cups with paper liners and set pans aside.
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Place the butter and sugar in a large mixing bowl and beat with an electric mixer set to medium until until blended. Beat in the vanilla, baking powder, baking soda, and salt and beat until well combined (mixture will be crumbly). Add the eggs and beat well.
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With mixer on low, beat in half of the flour followed by half of the buttermilk and beat to combine. Add the remaining flour mixture, then the remaining buttermilk and beat until just incorporated.
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Scrape down the sides and bottom of the bowl and beat a few seconds more. Divide the batter between the prepared muffin cups, filling each two-thirds full. Bake 16 to 20 minutes, until a cake tester inserted into the center of the cupcakes comes out clean.
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Remove cupcakes from the oven and cool completely on a wire rack before filling and frosting them. (You can store them at room temperature, covered with plastic wrap, overnight if you want to make them ahead. Just don’t fill them too far in advance.)