½cupunsweetened cocoa powderI use Dutch-processed (60g)
½cupboiling wateror strong brewed coffee (125ml)
2cupsall-purpose flour(250g)
1 ½teaspoonsbaking powder
1 ½teaspoonsbaking soda
¾cuplight brown sugar(150g)
1cupgranulated sugar(200g)
1tablespoonground cinnamon
¼teaspoonground nutmeg
¼teaspoonsalt
¼cuplight vegetable oil(60ml)
½cupbuttermilk125ml (or regular milk mixed with ½ tablespoon vinegar; let it sit a few minutes to curdle a bit)
2medium eggsat room temperature
For the cinnamon buttercream frosting (makes about 3 cups)
1½cups340 g unsalted butter, very soft but not melted — it should indent easily when pressed
3cupspowdered sugar(360g)
1½teaspoonsvanilla extract
½tablespoonground cinnamon
½cupheavy cream or heavy whipping creamat room temperature (125ml)
Instructions
Make the cake layers
Whisk the cocoa powder and boiling water in a small bowl until smooth. Set aside to cool.
½ cup unsweetened cocoa powder, ½ cup boiling water
In another bowl, whisk together the flour, sugars, baking powder, baking soda, cinnamon, nutmeg, and salt.
2 cups all-purpose flour, 1 ½ teaspoons baking powder, 1 ½ teaspoons baking soda, ¾ cup light brown sugar, 1 cup granulated sugar, 1 tablespoon ground cinnamon, ¼ teaspoon ground nutmeg, ¼ teaspoon salt
Add the oil and buttermilk to the flour mixture and mix with a hand mixer until combined, starting on low speed and increasing as needed.
¼ cup light vegetable oil, ½ cup buttermilk
Mix in the eggs and cooled cocoa mixture just until combined — don’t overmix.
2 medium eggs
Divide the batter evenly between 2 pans (I like to weigh the batter so both layers are the same size).
Bake for 30–35 minutes, or until a toothpick inserted in the center comes out clean.
Cool in the pans for 10 minutes, then run a spatula around the edges and turn the cakes out onto a wire rack. Remove parchment and let cool completely.
Wrap and refrigerate the cakes for at least 1 hour, then trim the tops.
Make the cinnamon buttercream frosting
Beat the butter in a stand mixer fitted with the paddle attachment (or use a hand mixer) for about 2 minutes, until smooth.
1½ cups 340 g unsalted butter, very soft but not melted — it should indent easily when pressed
Add the powdered sugar, vanilla, cinnamon, and cream. Start mixing on low (don't worry, it will look gloopy at first), then gradually increase to medium-high and beat for 10 minutes, scraping the bowl as needed.
3 cups powdered sugar, 1½ teaspoons vanilla extract, ½ tablespoon ground cinnamon, ½ cup heavy cream or heavy whipping cream
Beat on low for 1–2 more minutes to remove air bubbles, then stir with a spatula.
Assemble and decorate the cake
Unwrap the chilled cake layers.
Level the tops with a serrated knife or cake leveler.
Crumble the trimmed tops into fine crumbs (I use my fingers) and set aside.
Place one cake layer on a serving plate or stand and spread frosting evenly on top.
Add the second cake layer, cut side down, making sure it’s even.
Cover the cake with a thin crumb coat and refrigerate for about 30 minutes, then frost with the rest of the buttercream.
Decorate the top edge and bottom with the reserved crumbs.