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1
Preheat the oven to 350F.
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2
Butter two 9-by-2-inch round cake pans; line the bottoms with parchment paper.
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3
Butter parchment, and dust with flour, tapping out excess; set aside.
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4
Into a medium bowl, sift together flours, baking powder, and salt; set aside.
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5
In the bowl of an electric mixer fitted with the paddle attachment, beat the butter and sugar until light and fluffy, 3 to 4 minutes, scraping down the sides of the bowl as needed.
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6
Beat in eggs, one at a time, then beat in vanilla.
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7
With the mixer on low speed, add the flour mixture in three parts, alternating with the milk and beginning and ending with the flour; beat until combined after each addition.
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8
Divide the batter between the prepared pans, and smooth with an offset spatula.
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9
Bake rotating the pans halfway through, until cakes are golden brown and a cake tester inserted in the centers comes out clean, 30 to 35 minutes.
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10
Transfer pans to a wire rack to cool 20 minutes.
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11
Invert cakes onto the rack; peel off the parchment.
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12
Reinvert cakes and let them cool completely, top sides up.
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13
Using a serrated knife, trim the tops of the cakes to make level.
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14
Place one layer on a cake plate, and spread top with 3/4 cup Dark Chocolate Frosting.
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15
Place the other cake layer on top.
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16
Spread the entire cake with remaining frosting, swirling to coat in a decorative fashion.
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17
Cake can be kept in the refrigerator, covered with a cake dome, for up to 3 days.
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18
Let cake sit at room temperature for 20 minutes before serving.
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19
Line two standard 12-cup muffin pans with paper liners; set aside.
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20
Follow instructions for Yellow Butter Cake, dividing the batter evenly among the prepared cups so that each is about two-thirds full.
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21
Bake, rotating pans halfway through, until cupcakes are golden brown and a cake tester inserted in the center of a cupcake comes out clean, about 20 minutes.
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22
Transfer pans to a wire rack to cool.
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23
Invert cupcakes onto the rack; reinvert and let cool completely, top sides up.
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24
Spread about 1/4 cup frosting on top of each cupcake.
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25
They can be kept in an airtight container at room temperature for up to 3 days.