There are a multitude of chocolate cake recipes both in print and in the blogsphere. Between a friend and myself, we tested at least a half-dozen recipes. Some included as many as six eggs in the batter while others had as few as one egg.
There were recipes that included melted chocolate, as well as cocoa powder, others only included cocoa powder. Through testing we discovered that melted chocolate creates a drier cake than I desired. If I had read BakeWise before that trial and I would have discovered the results of melted chocolate. It was so dry, I opted to leave it out for the sake of the cake.
We also came to the conclusion that even though butter is tastier, a canola or vegetable oil works better in a chocolate cake as it also counters the drying effect of the cocoa powder. Buttermilk gives it a slight tang, but whole milk works fine too. I wouldn’t even think of using skim, 1 or 2 percent milk. I hope you won’t either. After many attempts this one is a winner.
3/4 cup (2 1/2 oz/70 g) non-alkalized cocoa powder, plus extra to dust sides of pans
2 teaspoons baking powder
1 1/2 teaspoons baking soda
2 cups (14 oz/400 g) granulated sugar
2 cups (9 oz/255 g) unbleached all-purpose flour
1 teaspoon kosher salt
1 tablespoon espresso powder
1 cup (8 oz) buttermilk
1/2 cup (4 oz) vegetable oil
2 teaspoon pure vanilla extract
2 large eggs
1 cup (8 oz) boiling water
Set a rack in the middle of the oven and preheat to 350°F. Butter two 9-inch cake pans with 2-inch sides. Line the bottom of the pans with parchment paper and dust the sides with cocoa powder, tapping out excess. Set aside.
Place a seive over the bowl of a stand mixer and sift the cocoa powder, baking powder and baking soda, sugar, flour, salt, and espresso powder. In a 2 cup glass measuring cup add the buttermilk, vegetable oil, and vanilla extract. Using a fork, beat the eggs into the buttermilk mixture.
Add the buttermilk mixture to the flour mixture and using the paddle attachment, beat on medium speed for 2 minutes. Pour in boiling water and beat for an additional minute. (The batter will be thin.) Be sure check that the batter at the bottom of the bowl is fully incorporated.
Divide the batter evenly between the two prepared pans. Bake until toothpick inserted into centers comes out clean, about 30-35 minutes. Cool cakes in pans on racks about 10 minutes. Turn out onto racks and cool completely prior to frosting the cake.













Chocolate-Mascarpone Buttercream Frosting
In theory large egg yolks should be the same size and weight, but in reality they are not. Therefore, I would encourage you to purchase a kitchen scale to weigh not just the yolks in this recipe but to weigh all of your ingredients baking ingredients.
Photo by Steve Young-Burns
Also, I learned a trick from Rose Levy Barenbaum. Add corn syrup to the sugar before heating. The corn syrup allows the sugar to come to a temperature of 240°F without the need for an instant read thermometer. I used one anyway the first time to get a sense of exactly how big the bubbles become when 240°F is reached.
6 lg (4 oz/112 g) egg yolks (egg whites can be frozen for another use)
1/2 teaspoon kosher salt
3/4 cup (5 1/4 oz/150 g) granulated sugar
1/2 cup (6 oz/166g) corn syrup
2 cups (1 lb/450 g) unsalted butter*, softened
1/2 cup (4 oz/115 g) mascarpone*
6 oz bittersweet chocolate, melted and cooled
Place the egg yolks and salt in the bowl of a stand mixer and using the whisk attachment whip them until pale yellow in color. While the yolks are whipping, in a small pan heat sugar and corn syrup; stirring with a heat-proof spatula to dissolve the sugar. Once the sugar is dissolved stop stirring and allow the syrup to come to a full boil (meaning large bubbles are covering the entire surface of the syrup).
After the eggs are whipped stop the machine and pour a small amount of the hot sugar syrup into the eggs. Quickly whip the mixture. Continue stopping the machine, pour in another tablespoon and whip. As the eggs heat up (test by touching the outside of the bowl with your hand) you can add more at a time. I found that by stopping the machine each time less sugar syrup gets spun onto the inside bowl.
When all the sugar syrup has been added, increase speed to medium-high and whip the egg/sugar mixture until the bowl is cool to the touch. Reduce the mixer speed to medium and add a couple of tablespoons of butter at a time incorporating each before adding the next knob of butter. After all the butter has been incorporated, add the chocolate (and mascarpone, if using.) Return the mixture to medium-high and whip until the buttercream is fluffy, a couple of minutes. Frost the cake and serve.
*Variation: Reduce the butter to 1 3/4 cups (12 oz/337.5 g) and increase the mascarpone to 1 cup (8 oz/230 g). Continue the recipe as above.
Chocolate Cake