Gingerbread Sheet Cake With Whipped Chocolate Ganache

Preparation

1. Step 1

   Make the cake: Set a rack in the center of the oven and heat oven to 350 degrees. Grease a 9-by-13-inch light colored metal baking pan with nonstick cooking spray and line it with a piece of parchment that hangs over the 2 long sides.

2. Step 2

   In a large bowl, combine the sugar and eggs, and use an electric mixer on medium or a whisk to beat the mixture until light and foamy, 1 to 2 minutes. Add the buttermilk, molasses, butter and oil, and mix until combined and smooth, 1 to 2 minutes.

3. Step 3

   Add the fresh ginger, ground ginger, cinnamon, cloves and salt, and mix to incorporate.

4. Step 4

   Add the flour, baking powder and baking soda, and mix until no streaks of dry ingredients remain, about 1 minute.

5. Step 5

   Pour the batter into the prepared baking pan, and tap on the counter a few times to release any large bubbles. Bake until puffed and set, and a tester inserted into the center comes out clean, 28 to 34 minutes. Cool the cake in the pan set on a rack for 15 minutes, then use the parchment paper overhang to lift the cake out of the pan. Set it on a rack to cool completely.

6. Step 6

   While the cake is cooling, make the ganache: Add the chocolate and butter to a large bowl or to the bowl of a stand mixer fitted with the whisk attachment. In a small saucepan, bring the cream to a simmer.

7. Step 7

   Pour the hot cream over the chocolate and butter in the bowl, and whisk until smooth, 1 to 2 minutes. Add the vanilla extract and salt, and whisk until incorporated. Let the mixture sit until slightly thickened, about 1 hour.

8. Step 8

   When the cake is cool and the ganache is thickened, whip the ganache on high speed until it’s lighter in both texture and color, fluffy, and holds soft peaks, about 10 minutes.

9. Step 9

   Dollop the ganache over the cooled cake, and use a spoon to spread it over the cake in swoops and swirls. Top with chopped crystallized ginger or shaved chocolate if desired. Store leftover cake in an airtight container in the fridge for up to 4 days.