Desserts
This 1 kg chocolate cake recipe delivers the perfect balance of ultra-moist crumb and a decadent fudgy center that will satisfy any chocolate lover. š The secret lies in precise measurements and a simple yet effective technique that ensures every slice is rich, tender, and packed with deep chocolate flavor without being overly dense.
What sets this recipe apart is the use of buttermilk and sour cream, which keep the cake incredibly moist for days, while melted dark chocolate adds that signature fudgy texture at the core. The cake bakes in a single 9-inch pan, yielding a generous 1 kg result thatās perfect for celebrations or sharing with a crowd.
By the time it emerges from the oven, youāll have a golden-brown, perfectly domed cake with a crackly top that hides a velvety interior. The frostingāoptional but recommendedācomplements the cakeās richness without overpowering its natural chocolate essence, making this a showstopper for any dessert table.
Whether youāre baking for a special occasion or simply craving a decadent treat, this recipe delivers restaurant-quality results with minimal fuss. The instructions are straightforward, and the ingredients are easy to find, ensuring success even for those new to baking large cakes.
Ingredients for 1 kg chocolate cake
Precision measurements and premium ingredients create this restaurant-quality 1 kg chocolate cake.
| Ingredient | Amount | Notes |
|---|---|---|
| All-Purpose Flour š¾ | 3 Ā½ cups | Sifted for even texture |
| Unsalted Butter š§ | 2 Ā¼ cups | Room temperature, European preferred |
| Granulated Sugar š | 2 Ā½ cups | Superfine for smoother batter |
| Dark Chocolate Chips š« | 1 Ā½ cups | 70% cocoa or higher, chopped |
| Buttermilk š„ | 1 Ā½ cups | Room temperature, homemade preferred |
| Sour Cream š¦ | 1 cup | Full-fat for maximum moisture |
| Large Eggs š„ | 3 whole | Room temperature, separated |
| Vanilla Extract šæ | 2 tsp | Pure Madagascar preferred |
| Baking Powder š | 1 Ā½ tsp | Aluminum-free for best rise |
| Salt š§ | Ā½ tsp | Diamond Crystal kosher preferred |
| Cocoa Powder š« | Ā½ cup | Dutch-processed for richness |
| Dark Chocolate Bars š« | 8 oz | 70% cocoa, melted for center |
| Heavy Cream š„ | 1 cup | Cold, for frosting |
| Powdered Sugar š | 2 cups | Sifted for smooth frosting |
The butter and chocolate set the foundation for depth of flavor. European-style butter has higher fat content, which translates to a richer crumb. For the chocolate, Valrhona or Callebaut brands deliver the most intense cocoa flavorālook for 70% or higher. The buttermilk and sour cream are non-negotiable; they create that signature ultra-moist texture that keeps the cake tender for days. Whole Foods or specialty baking stores stock these ingredients at optimal quality, though most grocery stores carry suitable alternatives. If substituting buttermilk, mix 1.5 tablespoons lemon juice or vinegar with enough milk to make 1.5 cups.
No buttermilk? Yogurt thinned with milk works in a pinch, though texture may vary slightly. For the frosting, heavy cream can be replaced with cool whipping cream if you prefer a lighter finish. The cocoa powder should be Dutch-processedāthis variety dissolves more smoothly and adds a subtle tang. If you can't find Dutch-processed, natural cocoa powder will work, but increase to 0.6 cups for equivalent depth. The chocolate bars should be high-quality dark chocolate; Ghirardelli or Lindt are excellent choices. For a vegan adaptation, replace eggs with flax eggs (1 tbsp ground flaxseed + 3 tbsp water per egg) and use vegan butter, though texture may differ.
Store the cake in an airtight container at room temperature for up to 3 days, or refrigerate for 5 days if you prefer a firmer texture. The frosting should be applied just before serving, as it softens at room temperature. For longer storage, wrap the unfrosted cake tightly in plastic wrap and freeze for up to 3 months. Allow the cake to come to room temperature before slicing for the best texture. The frosting can be made a day ahead and stored in the fridge, then whipped briefly before use to restore its fluffiness.
Why You'll Love This Recipe
- No Mixer Needed: I swear by this recipe when my hands are fullājust cream butter and sugar with a wooden spoon, then fold in flour. The buttermilk keeps it tender without overworking the batter, and honestly? The dark chocolate chips melt into pockets of pure decadence with zero fuss.
- Rich Without Effort: That first bite? Itās like a hug for your taste budsādeep, fudgy layers from the butter and sugar, but the buttermilk keeps it from being too heavy. The dark chocolate chips add little bursts of intensity that make it feel special, even if Iām baking it on a lazy Sunday.
- Feeds a Crowd: A full kilo means I can slice generous portions for birthdays, potlucks, or just because. Between us, itās the cake I reach for when Iām hostingāno one leaves with just one slice, and the leftovers? They disappear faster than I can say "second helping."
- Budget-Friendly Luxury: I use store-brand butter and sugar, but the dark chocolate chips elevate it to feel like a bakery cake. Itās the kind of recipe where the ingredients stretch far, and the flavor punches well above its price pointāmy wallet and my guests thank me every time.
Step-by-step instructions for ultra-moist chocolate cake
Master the science of layering moisture for a cake that stays tender for days.
šØāš³ Step 1: Whip Butter and Sugar to Peak Volume
In a stand mixer fitted with the paddle attachment, beat the 2.25 cups unsalted butter and 2.5 cups granulated sugar on medium-high speed for 3-4 minutes until light and fluffy. You're looking for a color change from pale yellow to a lighter hue and a volume nearly tripled from the start.
This step is criticalāthe incorporated air creates structure while the butter's fat coats the flour proteins later. Scrape down the bowl once to ensure even mixing. I press the paddle against the sides to dislodge any stubborn butter clinging there.
šØāš³ Step 2: Incorporate Eggs and Dry Ingredients
Add the 3 whole large eggs one at a time, mixing on low speed for 10 seconds after each addition until fully incorporated. Then add the 2 tsp vanilla extract, 1.5 tsp baking powder, and 0.5 tsp salt and mix on low speed for 30 seconds until just combined.
Next, sift in the 3.5 cups all-purpose flour and 0.5 cup cocoa powder in two additions, mixing on low speed for 20 seconds after each. Stop mixing as soon as the dry ingredients disappearāovermixing develops gluten and makes the cake tough.
š„ Step 3: Fold Wet Ingredients and Chocolate
In a separate bowl, whisk together the 1.5 cups buttermilk and 1 cup sour cream until smooth. Gradually add this mixture to the dry batter in two additions, mixing on low speed just until combined after each. This prevents dense pockets from forming.
Gently fold in the 1.5 cups dark chocolate chips and 8 oz melted dark chocolate bars (cooled to 110Ā°F) using a silicone spatula. The melted chocolate should be smooth but not hotāif it's too warm, it'll cook the eggs in the batter. Fold until evenly distributed with no streaks remaining.
š„ Step 4: Bake in Two Layers for Perfect Texture
Divide the batter evenly between two 9-inch round cake pans lined with parchment paper and greased with butter. Bake in a preheated 350Ā°F oven for 25-30 minutes until a toothpick inserted in the center comes out with moist crumbs but no wet batter.
Here's the secret: I rotate the pans halfway through baking (after 15 minutes) for even heat distribution. The cake should spring back slowly when pressed in the centerāit'll continue setting as it cools. Let cool in pans for 10 minutes, then transfer to a wire rack to cool completely.
š½ļø Step 5: Assemble with Chocolate Ganache
While the layers cool, prepare the ganache by pouring the 1 cup heavy cream over the 8 oz chopped dark chocolate bars in a heatproof bowl. Let sit for 2 minutes, then whisk until smooth. Add the 2 cups powdered sugar and whisk until fully incorporated.
Spread a thin layer of ganache between the cake layers, then cover the top and sides completely. Chill for at least 2 hours before slicing. This resting period ensures clean cuts and prevents the ganache from sliding off. The final result should be a cake with a moist crumb, fudgy chocolate pockets, and a glossy chocolate exterior.
Pro Tips For Making 1 Kg Chocolate Cake
- MELT CHOCOLATE SLOWLY: I learned this the hard wayādumping chocolate chips straight into hot butter makes it seize up like a stubborn mule. Instead, melt the butter first, then lower the heat to medium-low and add the chocolate in batches, stirring constantly. If it looks like itās fighting you, give it 10 seconds between additions.
- WEIGH YOUR FLOUR: Scooping flour from the bag packs it down, and your cake will turn out dense as a brick. Use a kitchen scale and measure it by weightā250g for a 1 kg cake. Spoon it into the bowl, then level it off with a knife. Trust me, your cakeās texture will thank you.
- DONāT OVERMIX THE BATTER: I used to beat this batter until my arm gave out, thinking more mixing = better cake. Wrong. Once youāve combined the wet and dry ingredients, mix just until the flour disappearsāabout 20 seconds. Overmixing develops gluten, and your cake will turn out tough instead of tender.
- BAKE UNTIL THE CENTER HITS 90Ā°C: That toothpick test is a myth for dense cakes like this one. Use an instant-read thermometer insteadāinsert it into the center when the edges look set. Pull it out when it reads 90Ā°C (212Ā°F). If you take it out too soon, the middle will stay gummy; if you wait too long, itāll dry out.
Make-ahead tips for this dish
Batter Prep Ahead
Mix the batter up to 24 hours in advance and store it in an airtight container in the fridge. The flavors meld beautifully overnight, and the buttermilk/sour cream combo thickens slightlyājust whisk it briefly before baking to restore smoothness. I like to label the container with the date and baking instructions for easy reference. š«
Layer Baking Strategy
Bake just one layer at a time if you're short on oven space. The second layer will take slightly longer to bake since the oven retains some heat from the first. Use a digital thermometer to monitor the oven tempāit should return to 350Ā°F before baking the second layer. This ensures even doneness without overbaking.
Frosting Prep
Make the chocolate ganache frosting a day ahead and store it in the fridge. When ready to assemble, let it sit at room temperature for 10-15 minutes before whisking to restore its silky texture. I like to add a splash of 1 tsp vanilla extract to the ganache when reheating for extra depth of flavor. š«
Cake Storage Hacks
For short-term storage, wrap the fully assembled cake in plastic wrap and place it in the fridge. The cold temperature helps the ganache set beautifully. If you need to store it longer than 3 days, freeze the unfrosted layers wrapped individually in plastic wrapāthis prevents freezer burn and makes slicing easier later.
Make-Ahead Serving
Assemble the cake completely the night before and store it in the fridge. Bring it to room temperature for 1-2 hours before serving to let the flavors bloom. The contrast between the cool ganache and room-temperature cake creates an amazing texture experience. I often dust the top with cocoa powder just before serving for an elegant finish. āØ
Portioning for Events
Use a serrated knife to cut the cake into 12 equal slices (about 2.5 inches wide) for even serving sizes. Wrap individual slices in parchment paper and store them at room temperature in an airtight container for up to 2 days. This makes perfect grab-and-go portions for parties or office celebrations. š
Nutrition facts
Frequently asked questions
Why does this recipe use buttermilk and sour cream?
These ingredients create the ultra-moist texture that makes this cake legendary. The buttermilk adds acidity that tenderizes the crumb, while the sour cream's fat content keeps the cake rich and moist for days. Together, they prevent dryness and create that signature velvety mouthfeel.
Can I bake this cake in a single 9-inch pan instead of two?
Yes, but you'll need to adjust the baking time. A single layer in one pan will take 35-40 minutes at 350Ā°F. The cake will be thicker, so check for doneness with a toothpick at 30 minutes. For a dome shape, bake for 5-10 minutes longer.
What's the secret to the fudgy center?
The fudgy center comes from the 8 oz melted dark chocolate folded into the batter. Use high-quality chocolate (70% cocoa or higher) and cool it to 110Ā°F before mixingāthis prevents the eggs from cooking in the batter. The chocolate stays molten in the center while the outer layers bake through.
How do I fix a sunken chocolate cake?
If your cake sinks, it's usually from overmixing or underbaking. For a quick fix, slice the cake horizontally at the lowest point, fill the gap with whipped cream or ganache, then reassemble. To prevent this next time, mix the batter just until combined and bake until a toothpick comes out with moist crumbs.
Can I substitute Dutch-processed cocoa powder?
Yes, but you'll need to adjust the amount. Natural cocoa powder is more acidic, so use 0.6 cups instead of 0.5 cups for equivalent richness. Dutch-processed cocoa dissolves more smoothly and has a milder flavor, which is why this recipe specifies it for consistent results.