This particular style of chocolate cake relies on oil instead of butter and a hot liquid addition that blooms the cocoa powder, both of which are what give it that reliably moist texture without needing any advanced technique.
Why This Method Actually Works
Using oil instead of butter means you skip the entire creaming step, since oil is liquid at room temperature and mixes directly into the batter without needing to be beaten with sugar first to incorporate air. This is part of why the cake stays moist for days rather than drying out the way some butter-based cakes can if slightly overbaked.
Adding hot coffee or hot water directly to the cocoa powder "blooms" it, intensifying the chocolate flavor significantly compared to simply mixing dry cocoa powder into a room-temperature batter. Don't worry if you're not a coffee drinker, the coffee flavor doesn't come through in the final cake, it simply deepens the chocolate taste.
Ingredients
2 cups (250g) all-purpose flour
2 cups (400g) granulated sugar
3/4 cup (65g) unsweetened cocoa powder
2 tsp baking soda
1 tsp baking powder
1 tsp salt
2 large eggs
1 cup (240ml) buttermilk
1/2 cup (120ml) vegetable oil
2 tsp vanilla extract
1 cup (240ml) hot coffee (or hot water if preferred)
Instructions
Prep your pan and oven. Preheat your oven to 350°F (175°C). Grease a 9x13 inch baking pan, or two 9-inch round pans if you'd prefer a layered cake, and set aside.
Combine the dry ingredients. In a large mixing bowl, whisk together the flour, sugar, cocoa powder, baking soda, baking powder, and salt until evenly combined, breaking up any clumps in the cocoa powder as you go.
Add the wet ingredients. Add the eggs, buttermilk, vegetable oil, and vanilla extract directly into the same bowl with the dry ingredients. Whisk until just combined and no dry streaks remain, being careful not to overmix.
Add the hot coffee. Slowly pour in the hot coffee while whisking continuously. The batter will become noticeably thin, which is expected and part of what keeps this cake so moist. Whisk just until fully incorporated.
Bake. Pour the batter into your prepared pan and bake for 30-35 minutes for a 9x13 pan, or 25-30 minutes for round layer pans, until a toothpick inserted in the center comes out with just a few moist crumbs attached.
Cool completely. Let the cake cool in the pan for about 15 minutes, then transfer to a wire rack to cool completely before frosting. Frosting a warm cake will cause the frosting to slide off or melt unevenly.
Tips for Best Results
Don't skip the hot coffee or hot water step even if you're tempted to save time by using room-temperature liquid instead. The heat is specifically what blooms the cocoa powder and deepens the chocolate flavor, and skipping it will result in a noticeably flatter-tasting cake.
Measure your flour properly by spooning it into the measuring cup and leveling it off, rather than scooping directly from the bag, which can pack in significantly more flour than the recipe intends and lead to a denser, drier cake.
What to Avoid
Don't overmix the batter once you've added the wet ingredients, since overmixing develops the gluten in the flour and can result in a tougher, denser cake rather than the tender crumb this method is designed to produce. Mix just until you no longer see dry streaks.
Also avoid opening the oven door frequently to check on the cake, especially in the first 20 minutes of baking, since the temperature fluctuation can cause the cake to sink in the middle before it's had a chance to fully set.
Variations
For a richer, more decadent version, fold in a cup of chocolate chips before pouring the batter into the pan. For a simple, elegant finish without a full frosting, dust the cooled cake with powdered sugar or drizzle with a simple chocolate ganache instead.
Frequently Asked Questions
Can I make this cake without coffee? Yes, hot water works as a direct substitute if you'd prefer to avoid coffee entirely, and the final cake won't taste like coffee either way, it simply enhances the chocolate flavor.
Can I make this into cupcakes instead? Yes, this batter works well as cupcakes. Fill liners about two-thirds full and bake at the same temperature for approximately 18-20 minutes, checking for doneness with a toothpick.
How should I store leftover cake? Store covered at room temperature for up to 3 days, or refrigerated for up to a week if it's already frosted. Bring refrigerated cake to room temperature before serving for the best texture.
📚 Sources
King Arthur Baking – Understanding Cake Chemistry and Ingredients, https://www.kingarthurbaking.com/learn/resources/cake-baking-guide
Serious Eats – The Food Lab's Guide to Chocolate Cake, https://www.seriouseats.com/the-food-lab-best-chocolate-cake-recipe
America's Test Kitchen – Baking Fundamentals, https://www.americastestkitchen.com/recipes
