Sheet cakes are some of the easiest cakes you can make! This chocolate sheet cake is incredibly moist and fudgy (almost like a brownie)! The frosting on the cake is a whipped chocolate ganache, but you can use any frosting you like.
Preheat your oven to 350°F. Prep a 9x13 inch baking dish by greasing the bottom and sides and lining with parchment paper. I like to leave a slight overhang of parchment paper up the sides to make it easier to pull the cake out!
In a large bowl, combine flour, cocoa powder, baking soda, baking powder, salt, and sugar. Whisk to combine.
Add your milk, oil, eggs, and vanilla to the dry ingredients. Whisk again to combine. You should have quite a thick batter at this point.
Add your hot coffee, and quickly (but carefully!) whisk it in to incorporate. Now you should have a very loose batter (that's what we're looking for!)
Pour your cake batter into your prepared baking dish. Bake in the center of your preheated 350°F oven for 20 to 25 minutes, or until a skewer inserted into the center comes out clean. Cool completely before frosting.
Make the whipped chocolate ganache: Heat heavy cream in a medium sized saucepan until it just starts to bubble along the sides. Take care not to let it boil (otherwise it'll be too hot for your chocolate).
Pour the cream over your chocolate and let it sit for 5 minutes to steep. After the 5 minutes are up, whisk until the chocolate is melted and you're left with a smooth mixture. Cover your ganache and refrigerate until it's fully cooled.
Pour your chilled ganache into a large bowl. Using an electric mixer fitted with the whip attachment (or your hands if you want a workout), beat the ganache until it turns a light brown color, about doubles in size, and holds a stiff peak.
Frost your cooled cake. (Optional) Top with sprinkles for added color and texture!
* I just made my coffee fresh by dissolving a teaspoon of instant espresso powder in 1 cup of boiling water. If you don't have coffee, or prefer not to use it, you can just use 1 cup of boiling water instead!