April 20, 2015
I really hope you love this chocolate cake as much as I do. Find a reason to celebrate and enjoy!
For the cake:
In a large, heat proof mixing bowl, whisk together granulated sugar and brown sugar (lumps are fine), then whisk in cocoa powder, baking soda and salt. Carefully pour boiling water in to cocoa mixture and immediately whisk to blend well, about 15 - 20 seconds. Allow to cool 5 minutes.
Using an electric hand mixer set on low speed blend in canola oil until combined, about 10 seconds. Add eggs to cocoa mixture and blend on low speed just until combined, about 5 seconds. Add egg yolks and vanilla extract and blend just to combined.
Allow to cool in pan 5 minutes, run butter knife around edge of cake and invert onto a wire rack and allow to cool completely (after about 20 minutes of cooling, I placed the cakes into an airtight container to seal in moisture while they finished cooling).
Trim tops from cake to form an even layer (they are quite domed so you don't need to make it completely level across - just add a little more frosting to the edges that aren't as level so you don't have to cut off so much cake).
For the chocolate buttercream frosting:
In a the bowl of an electric stand mixer, fitted with whisk attachment (paddle attachment works too. Whichever you use just pay attention the the shade of the butter), whip butter on moderately high speed until very pale and fluffy (nearly white in color), about 6 - 8 minutes, occasionally scraping down sides of the bowl.
Sift in cocoa powder then add in powdered sugar, 3 Tbsp heavy cream and vanilla and mix on low speed until combine, scrapping down the sides of the bowl as needed and adding up to 1 tbsp additional cream to thin if desired. Increase mixer to medium-high speed and whip mixture until pale and very fluffy about 4 - 5 minutes, occasionally scraping down sides of the bowl.
Chocolate Buttercream Frosting