One-Bowl Triple Chocolate Cake
This triple chocolate cake is the one I reach for when I want deep, dark chocolate flavor without a pile of dishes. A single bowl, a whisk, and a pan handle everything, and the crumb stays tender and rich for days.
The three layers of chocolate—cocoa and melted dark chocolate in the batter, a handful of semisweet chips folded through, and a silky chocolate glaze poured over the top—make it look far more involved than it is. It’s straightforward enough for a Tuesday and impressive enough for a birthday.
Why This Triple Chocolate Cake Works
The batter uses both cocoa powder and melted dark chocolate. Cocoa gives it that deep, almost Oreo-like backbone, while the melted chocolate adds moisture and a fudgy edge that plain cocoa cakes miss.
A cup of buttermilk keeps the crumb soft, and a full cup of sugar balances the bitterness of the dark chocolate without making the cake too sweet. The glaze is made from just chopped chocolate and warm cream, and it sets with a glossy finish that cracks slightly when you slice it.
I’ve made it in a round pan, an 8×8 square, and a loaf pan, and it works every time. It’s the kind of cake that tastes better on day two, after the chocolate has really settled in.
Ingredients
- 1 ½ cups (190g) all-purpose flour: gives enough structure without making the cake heavy
- ¾ cup (65g) unsweetened cocoa powder: use regular unsweetened, not Dutch-process, for the best rise (Dutch works too, the cake will just be a little tighter)
- 1 teaspoon baking powder
- 1 teaspoon baking soda
- ½ teaspoon salt
- ½ cup (115g) unsalted butter, cut into small cubes
- 2 oz (55g) dark chocolate (around 60–70% cacao), chopped: the deeper the chocolate, the more intense the cake
- 1 cup (200g) granulated sugar
- 2 large eggs, room temperature: cold eggs can make the melted butter seize up
- 2 teaspoons vanilla extract
- 1 cup (240ml) buttermilk, room temperature: the tang keeps the cake from tasting flat
- ¾ cup (130g) semisweet chocolate chips: these hold their shape while baking, so you get little pockets of melted chocolate
For the glaze
- 3 oz (85g) dark chocolate, chopped
- ⅓ cup (80ml) heavy cream
Variations / Substitutions
- Swap the chocolate chips: use bittersweet chips or chopped milk chocolate for a sweeter bite. White chocolate chips work too, but they’ll make the cake noticeably sweeter.
- No buttermilk: stir 1 tablespoon of lemon juice or white vinegar into 1 cup of whole milk, let it sit 5 minutes, and use that.
- Dairy-free: use a neutral oil instead of butter (melted coconut oil is fine), plant-based milk soured with vinegar, and a dairy-free heavy cream alternative for the glaze. Choose chocolate that’s dairy-free as well.
- Add espresso: stir 1 teaspoon of instant espresso powder into the wet ingredients to bring out the chocolate even more without tasting like coffee.
If you want something even quicker but just as chocolatey, our Double Chocolate Banana Muffins are a good one to have in your back pocket.
How to Make One-Bowl Triple Chocolate Cake
Step 1: Melt the Chocolate and Butter
Place the ½ cup cubed butter and 2 oz chopped dark chocolate in a large microwave-safe bowl. Microwave in 20-second bursts, stirring between each, until completely smooth, about 1 to 2 minutes total. Set the bowl aside to cool slightly while you get everything else ready.
The mixture will look glossy and fluid, with no flecks of butter. Give it a minute or two to lose the steam before you add the eggs, so you don’t scramble them.
Step 2: Whisk the Wet Ingredients
To the same bowl, add the 1 cup granulated sugar, 2 eggs, 2 teaspoons vanilla, and 1 cup buttermilk. Whisk until the mixture is uniform and the sugar starts to dissolve, about 30 seconds.
The batter will thin out and turn a shade lighter, almost like a melted chocolate milkshake. If your eggs or buttermilk are cold, the mixture might look a bit streaky; whisk a few extra seconds and it will come together.
Step 3: Stir in the Dry Ingredients
Place a sieve over the bowl and sift in the 1 ½ cups flour, ¾ cup cocoa powder, baking powder, baking soda, and ½ teaspoon salt. Whisk together until no dry streaks remain and the batter is smooth, about 30 seconds.
Sifting the cocoa and flour together prevents those dry cocoa lumps that hide in the batter. Stop whisking as soon as everything disappears; overworking can make the cake tough.
Step 4: Fold in the Chocolate Chips
Switch to a spatula and fold in the ¾ cup semisweet chocolate chips just until they’re evenly distributed. A few stirs is all you need.
The chips will stay suspended in the thick batter instead of sinking to the bottom, so you’ll get chocolate in every bite.
Step 5: Bake and Glaze the Cake
Preheat your oven to 350°F (175°C). Grease a 9-inch round cake pan and line the bottom with parchment paper. Scrape the batter into the pan and smooth the top. Bake for 30 to 35 minutes, until the top springs back when lightly pressed and a toothpick inserted in the center comes out with a few moist crumbs, not wet batter.
Let the cake cool in the pan for 10 minutes, then run a knife around the edge and turn it out onto a wire rack to cool completely. While it cools, make the glaze: heat the ⅓ cup heavy cream in a small saucepan until just simmering, then pour it over the 3 oz chopped dark chocolate in a bowl. Let it sit for a minute, then whisk until smooth. Once the cake is fully cool, pour the glaze over the top, letting it drip down the sides. Slice and serve while the glaze is still slightly soft, or let it set for a glossy crackled top.
Tips for the Best Triple Chocolate Cake
- Let the melt cool for a couple of minutes before adding sugar and eggs. Even a slightly hot bowl can scramble the eggs.
- Room-temperature buttermilk and eggs mix in more evenly. If you forgot to pull them out, place the eggs in a bowl of warm water for 5 minutes and microwave the buttermilk in 10-second bursts until it’s just warm to the touch.
- Don’t open the oven door before the 25-minute mark. The cake can sink a little in the middle if a blast of cool air hits it too soon.
- The glaze thickens as it cools. If it gets too stiff to pour, reheat it gently in the microwave for 10 seconds and stir.
Bake times by pan:
| Pan | Oven Temp | Time |
|---|---|---|
| 8-inch round | 350°F (175°C) | 35–40 mins |
| 9-inch round | 350°F (175°C) | 30–35 mins |
| 8×8 inch square | 350°F (175°C) | 25–30 mins |
| 9×5 inch loaf | 350°F (175°C) | 50–55 mins |
Keeping It Fresh
Wrap leftover cake tightly in plastic wrap or store it in an airtight container in the fridge for up to 5 days. The glaze stays glossy even when cold. For the best texture, let a slice sit at room temperature for 10 minutes before eating, or give it 15 seconds in the microwave to soften the chocolate chips inside.
What to Serve with Triple Chocolate Cake
A scoop of good vanilla ice cream is the obvious move because the cold cream cuts through the richness of the glaze. Fresh raspberries or sliced strawberries work well too, their tartness brightens each bite. A cold glass of milk is all you really need, though.
Frequently Asked Questions
Can I skip the melted chocolate and just use more cocoa?
You can, but the cake will be lighter and drier. Replace the 2 oz melted chocolate with an extra 2 tablespoons of cocoa mixed with 2 tablespoons of melted butter or oil for a closer match.
Why did my cake sink in the middle?
A sudden drop in oven temperature is the most common reason. Make sure the door stays closed until at least 25 minutes into baking, and check that your baking powder and soda are fresh.
Can I freeze this cake?
Yes. Freeze the unglazed cake, wrapped in two layers of plastic wrap, for up to 3 months. Thaw it in the fridge overnight, then make the glaze fresh and pour it over before serving.
Can I use a different chocolate for the glaze?
Absolutely. Semisweet, milk, or even white chocolate all work with the same cream ratio. Keep in mind milk and white chocolate will make a softer, sweeter glaze, so you may need a little less cream to keep it thick enough to set.
One-Bowl Triple Chocolate Cake Recipe
Ingredients
Method
- Microwave the butter and 2 oz dark chocolate in a large bowl in 20-second bursts until smooth, about 1–2 minutes. Let cool slightly.
- Whisk the sugar, eggs, vanilla, and buttermilk into the melted chocolate mixture until smooth.
- Sift the flour, cocoa powder, baking powder, baking soda, and salt into the bowl and whisk just until no dry streaks remain.
- Fold in the chocolate chips with a spatula.
- Preheat oven to 350°F (175°C). Pour batter into a greased and parchment-lined 9-inch round pan. Bake 30–35 minutes until a toothpick comes out with moist crumbs. Cool completely, then heat the cream to a simmer and pour over the 3 oz chopped chocolate; whisk smooth and pour over the cake before serving.
