from smitten kitchen, http://smittenkitchen.com/2009/07/best-birthday-cake/
Best Yellow Layer Cake
Everyone needs a killer yellow cake recipe. This is mine, and dare I say, it should be yours too. It just works. Every time. And if you’ve ever tried a yellow cake mix and wondered why yours didn’t come out that consistently plush (but not freakishly unnatural) at home, dare I say it’s because you hadn’t made this one yet?
Yield: Two 9-inch round, 2-inch tall cake layers, and, in theory, 22 to 24 cupcakes, two 8-inch squares or a 9×13 single-layer cake (I have yet to audition the cupcakes, shame on me)
4 cups plus 2 tablespoons (480 grams) cake flour (not self-rising)
2 teaspoons (10 grams) baking powder
1 1/2 teaspoons baking soda
1 teaspoon (5 grams) table salt
2 sticks (1 cup, 1/2 pound or 225 grams) unsalted butter, softened
2 cups (400 grams) sugar
2 teaspoons (10 ml) pure vanilla extract
4 large eggs, at room temperature
2 cups buttermilk (475 ml), well-shaken
Preheat oven to 350°F. Butter two 9-inch round cake pans and line with circles of parchment paper, then butter parchment. (Alternately, you can use a cooking spray, either with just butter or butter and flour to speed this process up.)
Sift together flour, baking powder, baking soda, and salt in a medium bowl. In a large mixing bowl, beat butter and sugar in a large bowl with an electric mixer at medium speed until pale and fluffy, then beat in vanilla. Add eggs 1 at a time, beating well and scraping down the bowl after each addition. At low speed, beat in buttermilk until just combined (mixture will look curdled). Add flour mixture in three batches, mixing until each addition is just Incorporated.
Spread batter evenly in cake pan, then rap pan on counter several times to eliminate air bubbles. (I like to drop mine a few times from two inches up, making a great big noisy fuss.) Bake until golden and a wooden pick inserted in center of cake comes out clean, 35 to 40 minutes. Cool in pan on a rack 10 minutes, then run a knife around edge of pan. Invert onto rack and discard parchment, then cool completely, about 1 hour.
FUDGE FROSTING: note- i didn’t really put enough chocolate in!
Instant Fudge Frosting
Adapted, barely, from a Sky High recipe.
Makes about 5 cups
6 ounces unsweetened chocolate, melted and cooled
4 1/2 cups confectioners’ sugar (no need to sift)
3 sticks (12 ounces) unsalted butter, at room temperature
6 tablespoons half-and-half or whole milk
1 tablespoon vanilla extract
Place all of the ingredients in a food processor and pulse to incorporate, then process until the frosting is smooth.
Frosting tip: If your kitchen is as hot and sticky as mine is in the summer, you’ll want to watch a frosting like this carefully to make sure it doesn’t get too melty and soft. If it does, periodically put the bowl of frosting and your partially frosting cake back in the fridge to let it firm up and cool down again, then resume where you left off.
Planning to write on your cake? Whirl all of the frosting ingredients except the melted chocolate in the food processor until smooth. Set aside a half-cup of the white frosting for tinting and writing, then add the chocolate to finish making the frosting.