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Preheat oven to 350F and line muffin tin with liners.
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In a large bowl, sift together: pastry flour, all-purpose flour, baking powder, baking soda and salt. Set aside.
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In a bowl of a stand mixer with a paddle attachment, cream together the butter and sugar until flight and fluffy.
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To the creamed butter and sugar, add eggs one at a time making sure they are well incorporated before the next addition.
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In a liquid measuring cup, combine the buttermilk with the vanilla.
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On a low setting, add the dry and liquid ingredients to the butter/sugar/egg mixture starting and ending with dry ingredients (ie. add 1/3 dry, 1/2 wet, 1/3 dry, 1/2 wet, 1/3 dry).
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Fill muffin tin 2/3 to 3/4 of the way full with batter.
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Bake in preheated oven until a wooden stick inserted in the center of a cupcake comes out clean, about 20 - 25 minutes. Perfect time to make the icing!