6-Inch Mini Chocolate Cake (Moist and Fudgy)
This 6-inch mini chocolate cake is just the right size when you want a real chocolate cake without a towering layer cake. It bakes up moist and deeply chocolatey, with a simple fudgy frosting that comes together in one bowl.
It’s the cake I turn to for weeknight birthdays, small celebrations, or honestly any Tuesday that needs a little something extra.
Why This Little Cake Works
The crumb stays tender for days because of buttermilk and a touch of oil. The flavor is bold but not too sweet, so the rich frosting balances without making your teeth hurt.
A 6-inch cake bakes fast and you can frost it right in the pan if you like, which means less fuss and more slices in your hand.
Ingredients
- 1/2 cup (60g) all-purpose flour: spoon and level for accuracy so the cake isn’t dry.
- 1/4 cup (30g) unsweetened cocoa powder: natural or Dutch-process both work.
- 1/2 teaspoon baking soda
- 1/4 teaspoon salt
- 1/4 cup (60ml) whole milk
- 1/4 cup (60ml) buttermilk: or regular milk stirred with 1 teaspoon vinegar and left 5 minutes.
- 1/4 cup (60ml) vegetable oil
- 1/2 cup (100g) granulated sugar
- 1 large egg
- 1 teaspoon vanilla extract
- 1/4 cup (60ml) hot water: or hot brewed coffee for an even richer taste.
For the frosting:
- 1/4 cup (60g) unsalted butter, softened
- 1 1/2 cups (180g) powdered sugar
- 3 tablespoons unsweetened cocoa powder
- 2 to 3 tablespoons whole milk or cream, plus more as needed
- 1/2 teaspoon vanilla extract
Variations / Substitutions
- Dairy-free: Replace the buttermilk with almond milk plus vinegar and use a vegan butter for the frosting.
- Extra fudgy: Stir 1 ounce of melted dark chocolate into the batter after adding the hot water.
- Cupcakes: Divide the batter evenly among 4 to 5 muffin liners, then bake at 350°F for 18 to 20 minutes until the centers spring back.
For a vanilla counterpart, check out our Mini Vanilla Cake recipe.
How To Make Mini Chocolate Cake
Step 1: Sift the Dry Ingredients
Sift the 1/2 cup flour, 1/4 cup cocoa powder, 1/2 teaspoon baking soda, and 1/4 teaspoon salt into a medium bowl. Whisk them together for about 30 seconds, until the mixture looks uniformly dark with no pale streaks.
This quick whisk catches any lumps and means no baking soda pockets later, so take your time.
Step 2: Whisk the Wet Ingredients
In a separate bowl, whisk together the 1/4 cup milk, 1/4 cup buttermilk, 1/4 cup oil, 1/2 cup sugar, 1 egg, and 1 teaspoon vanilla. Keep whisking until the sugar dissolves and the mixture is smooth, about 1 minute.
The mixture will look a bit thin, but that’s exactly what keeps the cake soft.
Step 3: Combine the Batter and Bake
Heat the oven to 350°F (175°C). Grease a 6-inch round cake pan and line the bottom with a round of parchment. Pour the wet ingredients into the dry and fold gently with a spatula. As soon as the flour disappears, about 30 seconds, stir in the 1/4 cup hot water until the batter is smooth. Scrape it into the prepared pan.
Bake for 25 to 30 minutes, until the center springs back when lightly pressed and a toothpick inserted in the middle comes out clean. The top will look set and slightly domed.
Step 4: Frost the Cake
Let the cake cool in the pan for 10 minutes, then turn it out onto a rack to cool completely, about 1 hour. While it cools, beat the 1/4 cup butter with an electric mixer until smooth, about 1 minute. Sift in the 1 1/2 cups powdered sugar, 3 tablespoons cocoa, then add 2 tablespoons milk and 1/2 teaspoon vanilla. Beat on low until the sugar is incorporated, then increase speed and whip until fluffy, another 1 to 2 minutes. If the frosting seems too thick, add the last tablespoon of milk.
Spread the frosting thick over the top of the cooled cake, using an offset spatula for swoops. Slice and serve while the frosting is still a bit soft, or pop the cake in the fridge for 15 minutes if you want a neater cut.
Tips for the Best Mini Chocolate Cake
- Weighing flour and cocoa takes the guesswork out and prevents a dry cake.
- Use an offset spatula dipped in hot water for a smooth, bakery-style finish.
- For a small layer cake, double the recipe and bake two 6-inch rounds; stack with extra frosting.
Scale the batter for other pan sizes:
| Pan Size | All-purpose Flour | Granulated Sugar | Large Eggs | Bake Time (350°F) |
|---|---|---|---|---|
| 6-inch | 1/2 cup (60g) | 1/2 cup (100g) | 1 | 25-30 mins |
| 8-inch | 1 cup (120g) | 1 cup (200g) | 2 | 30-35 mins |
Storing Your Cake
- Room temperature: Keep the cake covered on the counter for up to 2 days. A cake dome or overturned bowl works great.
- Refrigerate: Store in an airtight container for up to 5 days; let it come to room temperature before serving for the best texture.
- Freeze: Wrap the unfrosted cake tightly in plastic and freeze for up to 3 months. Thaw, then frost.
Frequently Asked Questions
Can I make this cake gluten-free?
Yes, I have had good results using a 1:1 gluten-free flour blend in place of the all-purpose flour. The cake may be slightly more delicate, but it holds together fine.
Do I need a mixer for the frosting?
A hand mixer makes it faster, but you can beat the butter with a sturdy whisk and some elbow grease. Just make sure the butter is very soft.
Can I bake this as cupcakes?
Absolutely. Divide the batter evenly among 4 to 5 paper-lined muffin cups and bake at 350°F for 18 to 20 minutes, until a toothpick comes out clean.
Can I use melted butter instead of oil?
You can, but the cake will be slightly less moist. Melted unsalted butter works; let it cool a bit before mixing with the other wet ingredients.
Mini Chocolate Cake Recipe
Ingredients
Method
- Sift flour, 1/4 cup cocoa, baking soda, and salt into a bowl; whisk 30 seconds.
- Whisk milk, buttermilk, oil, sugar, egg, and 1 teaspoon vanilla until smooth, about 1 minute.
- Heat oven to 350°F. Grease and line a 6-inch pan. Fold wet into dry, then stir in hot water. Bake 25-30 minutes.
- Cool cake completely. Beat butter, then sift in powdered sugar and cocoa; add 2 tablespoons milk and 1/2 teaspoon vanilla. Whip until fluffy. Frost and serve.
