A rich, moist, and foolproof chocolate cake that comes together in one bowl — perfect for beginners and seasoned bakers alike.
Servings 8
Ingredients
- 1.8 cups all-purpose flour
- 0.8 cups unsweetened cocoa powder
- 2 cups granulated sugar
- 2 teaspoons baking soda
- 1 teaspoons baking powder
- 1 teaspoons salt
- 2 large eggs
- 1 cups buttermilk
- 1 cups warm water
- 0.5 cups vegetable oil
- 2 teaspoons pure vanilla extract
- 1 cups unsalted butter (softened, for frosting)
- 3.5 cups powdered sugar (for frosting)
- 0.5 cups cocoa powder (for frosting)
- 0.3 cups heavy cream (for frosting)
- 1 teaspoons vanilla extract (for frosting)
Steps
Preheat & Prepare Pans: Preheat your oven to 350°F (175°C). Grease two 9-inch round cake pans generously with butter or non-stick spray, then dust lightly with cocoa powder (instead of flour) to prevent sticking. Line the bottoms with parchment paper circles for easy removal. Set aside.
Mix the Dry Ingredients: In a large mixing bowl, sift together 1.8 cups all-purpose flour, 0.8 cups unsweetened cocoa powder, 2 cups granulated sugar, 2 teaspoons baking soda, 1 teaspoons baking powder, and 1 teaspoons salt. Sifting is important — it removes lumps and aerates the mixture, giving you a lighter, more even crumb. Whisk the dry ingredients together until well combined.
Add the Wet Ingredients: Add 2 large eggs, 1 cups buttermilk, 1 cups warm water, 0.5 cups vegetable oil, and 2 teaspoons pure vanilla extract directly into the bowl with the dry ingredients. Using a hand mixer or stand mixer on medium speed, beat everything together for about 2 minutes until smooth and fully combined. The batter will be thin — this is completely normal and is actually the secret to an ultra-moist cake!
Pour & Bake: Divide the batter evenly between the two prepared cake pans. Give each pan a gentle tap on the counter to release any air bubbles. Place both pans in the center of the preheated oven and bake for 30–32m 30s , or until a toothpick inserted in the center comes out clean or with just a few moist crumbs.
Cool the Cakes: Remove the cakes from the oven and allow them to cool in their pans for 10 minutes . Then carefully turn them out onto a wire cooling rack, peel off the parchment paper, and allow them to cool completely before frosting. Frosting a warm cake will melt the buttercream, so patience is key!
Make the Chocolate Buttercream Frosting: In a large bowl, beat 1 cups unsalted butter (softened, for frosting) with a hand mixer on medium-high speed until light and fluffy, about 5 minutes . Sift in 3.5 cups powdered sugar (for frosting) and 0.5 cups cocoa powder (for frosting) gradually, alternating with 0.3 cups heavy cream (for frosting), and continue beating until smooth. Add 1 teaspoons vanilla extract (for frosting) and beat for another 2 minutes until the frosting is creamy, fluffy, and spreadable. If it’s too thick, add a splash more cream; too thin, add a bit more powdered sugar.
Assemble & Frost the Cake: Place one cooled cake layer on a cake board or serving plate. Spread a generous layer of chocolate buttercream on top using an offset spatula. Carefully place the second cake layer on top, pressing gently. Apply a thin ‘crumb coat’ of frosting all over the outside of the cake, then refrigerate for 15 minutes to set. Finally, apply a thick, even final coat of frosting all over the top and sides. Smooth with a spatula or create swirls for a decorative finish.
Decorate & Serve: Decorate your cake as desired — try chocolate shavings, sprinkles, fresh berries, or a drizzle of melted chocolate. Slice with a sharp knife (wiped clean between cuts for neat slices) and serve at room temperature. Store any leftovers covered at room temperature for up to 3 days, or refrigerate for up to 5 days.

Notes
6 Benefits of This Easy Chocolate Cake:
- 🍫 Mood-Boosting Power — Chocolate contains phenylethylamine and serotonin precursors that naturally elevate mood and reduce feelings of stress and anxiety, making every slice a little pick-me-up.
- 💪 Rich in Antioxidants — Cocoa powder is packed with flavonoids and polyphenols — powerful antioxidants that help fight free radicals in the body and support overall cellular health.
- ❤️ Supports Heart Health — The flavanols found in dark cocoa have been linked to improved blood circulation, reduced blood pressure, and better cardiovascular function when consumed in moderation.
- 🧠 Boosts Brain Function — Studies suggest that cocoa flavanols may enhance blood flow to the brain, improving focus, memory, and cognitive performance — so dessert can actually be smart!
- 🎉 Builds Social Connections — Baking and sharing a homemade cake strengthens bonds with family and friends. The act of creating something from scratch and sharing it fosters warmth, generosity, and lasting memories.
- 🌿 Energy & Mineral Source — Cocoa is a natural source of magnesium, iron, and zinc — minerals essential for energy production, immune function, and muscle recovery, giving your body subtle nutritional support alongside the indulgence.
Pro Tips:
- Use room-temperature eggs and buttermilk for a smoother batter.
- Don’t skip the warm water — it blooms the cocoa and deepens the chocolate flavor dramatically.
- For extra richness, substitute the warm water with hot brewed coffee.
Here’s a quick summary of what’s packed into this recipe:
The Cake features a perfectly balanced one-bowl batter with cocoa powder, buttermilk, and warm water — the trio responsible for that incredibly moist, rich crumb. No fancy equipment needed!
The Frosting is a creamy chocolate buttercream made from scratch — silky, fluffy, and deeply chocolatey.
The 6 Benefits (found in the Notes/Tips section of the recipe card) highlight why indulging in this chocolate cake isn’t just delicious — it’s actually backed by some real nutritional and emotional goodness:
- 🍫 Mood-Boosting Power
- 💪 Rich in Antioxidants
- ❤️ Supports Heart Health
- 🧠 Boosts Brain Function
- 🎉 Builds Social Connections
- 🌿 Energy & Mineral Source

