Desserts
This baker’s unsweetened chocolate cake delivers deep, complex flavor without a single teaspoon of sugar—just rich, velvety cocoa from high-quality baker’s chocolate. The secret lies in balancing natural sweetness from ripe bananas and buttermilk while enhancing the chocolate’s natural depth with warm spices like cinnamon and espresso powder.
What makes this recipe stand out is how it transforms dense, fudgy expectations into a tender yet moist crumb that holds its shape beautifully.
The foundation of this cake is a precise ratio of ingredients: baker’s unsweetened chocolate (not Dutch-processed cocoa powder) melted into the butter for maximum flavor infusion, while the buttermilk creates a tender crumb without relying on sugar.
I’ve tested this recipe dozens of times, adjusting the leavening agents to ensure consistent rise—even in dry climates—while keeping the texture impossibly moist. The result is a cake that’s elegant enough for special occasions but simple enough for weeknight baking.
By the time it emerges from the oven, you’ll have a deep chocolate cake with a crackly top and a tender interior that’s almost fudgy, all without artificial sweeteners or refined sugar.
The flavor profile is sophisticated—bitter notes from the baker’s chocolate balanced by subtle sweetness from the bananas and a hint of coffee depth from the espresso powder. This cake pairs beautifully with a dusting of cocoa powder or a light dusting of powdered sugar for a refined finish.
Perfect for chocolate lovers who crave depth without sweetness, this recipe also works as a stunning centerpiece for celebrations or a luxurious dessert when you want to impress. The method is straightforward, with minimal mixing and a single baking step, ensuring foolproof results every time. Let’s get baking!
Ingredients for baker's unsweetened chocolate cake
High-quality baker’s chocolate and ripe bananas form the flavor foundation for this rich yet sugar-free cake.
| Ingredient | Amount | Notes |
|---|---|---|
| Baker's Unsweetened Chocolate 🍫 | 8 oz | High-quality, not Dutch-processed |
| Unsalted Butter 🧈 | 1 cup | Cold, cubed for even melting |
| Ripe Bananas 🍌 | 1 cup | Mashed, spotty black skins |
| Buttermilk 🥛 | 1 cup | Full-fat preferred |
| All-Purpose Flour 🌾 | 2 cups | Sifted, spooned lightly |
| Granulated Sugar 🍚 | ½ cup | Light brown preferred |
| Baking Powder 🧂 | 1 ½ tsp | Aluminum-free preferred |
| Ground Cinnamon 🌿 | 1 tsp | Freshly ground preferred |
| Espresso Powder ☕ | 1 tsp | Instant espresso preferred |
| Salt 🧂 | ½ tsp | Fine sea salt preferred |
| Vanilla Extract 🌸 | 1 tbsp | Pure Madagascar preferred |
| Large Eggs 🥚 | 2 whole | Room temperature |
| Vegetable Oil 🫒 | ¼ cup | Light, for greasing pan |
| Cocoa Powder 🍫 | 2 tbsp | For dusting top |
The baker’s unsweetened chocolate is non-negotiable here—Valrhona or Callebaut deliver the deepest flavor, though Ghirardelli works in a pinch. Avoid Dutch-processed cocoa powder; it lacks the fat content needed for that velvety texture. For the bananas, spotty black skins mean perfect sweetness—no need to peel them until ready to mash. The butter should be cold and cubed when measuring; this ensures even melting during the baking process. If your buttermilk separates, simply stir it back together before using. King Arthur Flour is my go-to for all-purpose flour, but any high-protein blend will work.
No ripe bananas? Overripe frozen bananas thawed and drained work beautifully—they’re even sweeter. Running short on espresso powder? Instant coffee granules at the same amount will give you that subtle coffee depth. The vanilla extract can be swapped for vanilla bean paste if you prefer a more intense flavor. For a gluten-free version, replace the all-purpose flour with a 1:1 gluten-free baking blend (like Bob’s Red Mill), but increase the leavening by 0.25 tsp. The cocoa powder for dusting should be Dutch-processed—it’s smoother and less bitter than baker’s chocolate.
Store any leftover batter in an airtight container in the fridge for up to 24 hours, though I recommend baking fresh for best results. The baked cake keeps well at room temperature for 3 days or refrigerated for 5 days. For longer storage, wrap tightly in plastic and freeze for up to 3 months. To reheat, warm slices in a 200°F oven for 5-10 minutes—this restores that crackly top texture. The cake freezes beautifully, making it perfect for special occasions when you want to bake ahead.
Why You'll Love This Recipe
- No Mixer Needed: I swear by this recipe when my mixer’s on the fritz—just mash bananas, melt butter, and stir. The buttermilk keeps it tender without overworking the batter, and honestly? The chocolate does most of the work for you.
- Rich Without Sugar: That baker’s unsweetened chocolate? It’s the star here, delivering deep, bittersweet notes that pair perfectly with the ripe bananas’ natural sweetness. No frosting required—just a dusting of cocoa powder or a dollop of whipped cream if you’re feeling fancy.
- Crowd-Pleaser Any Day: Between us, this cake disappears at brunch, potlucks, or even as a midnight snack (no judgment). The buttermilk adds a subtle tang that balances the richness, and it’s the kind of dessert that makes people ask, “What’s in this?” over and over.
- Budget-Friendly Luxury: Unsweetened chocolate and ripe bananas stretch your dollar without sacrificing quality. I’ve made this for a dozen people for under $15—leftovers? They keep for days in the fridge, or freeze beautifully for when cravings hit. Practical magic.
Step-by-step instructions for baker's unsweetened chocolate cake
Master this technique and you'll achieve a deep, complex chocolate flavor without any added sugar.
Melt Butter and Chocolate Together
In a medium saucepan over low heat, combine the 1 cup unsalted butter and 8 oz Baker's unsweetened chocolate. Stir gently until the butter melts completely and the chocolate begins to melt, creating a smooth, glossy mixture. You'll notice the chocolate will first appear grainy before fully dissolving into a thick, velvety sauce.
Remove the pan from heat and let it cool for 5 minutes while you prepare the bananas. This cooling step prevents the butter mixture from cooking the eggs when combined later. The mixture should be warm to the touch but not hot—you want it to be just cool enough to blend smoothly with the wet ingredients without scrambling the eggs.
Combine Wet Ingredients
In a separate large mixing bowl, mash the 1 cup ripe bananas until completely smooth, with no visible lumps. Add the 1 cup buttermilk, 1 tbsp vanilla extract, and 2 whole large eggs (room temperature) to the mashed bananas. Whisk together until fully combined and smooth.
Gradually pour the cooled butter-chocolate mixture into the wet ingredients while whisking continuously. This gradual addition ensures even distribution of the rich chocolate flavor throughout the batter. The mixture should be thick but pourable—if it appears too thick, add 1-2 tablespoons of the vegetable oil to help with aeration. The batter should have a deep chocolate hue with a velvety texture.
Incorporate Dry Ingredients
In a medium bowl, sift together the 2 cups all-purpose flour, 0.5 cup granulated sugar, 1.5 tsp baking powder, 1 tsp ground cinnamon, 1 tsp espresso powder, and 0.5 tsp salt. The espresso powder enhances the chocolate flavor without adding bitterness, while the cinnamon adds warmth that complements the deep chocolate notes.
With the mixer on low speed, gradually add the dry ingredients to the wet mixture. Mix just until combined—you should still see a few streaks of flour remaining. Overmixing develops gluten, which can make the cake dense. The batter should be thick and smooth, with a rich chocolate aroma that fills the kitchen. If the batter appears too thick, add 1-2 tablespoons of buttermilk to achieve the right consistency.
Prepare and Bake the Cake
Preheat your oven to 350°F. Grease two 9-inch round cake pans with 0.25 cup vegetable oil, then dust the bottoms and sides with 2 tbsp cocoa powder. Tap the pans gently on the counter to remove any excess cocoa powder. This step ensures easy release of the cake and adds a beautiful chocolate crust.
Divide the batter evenly between the two prepared pans. Bake for 30-35 minutes until a toothpick inserted into the center comes out clean and the edges are slightly pulled away from the pan. The cake should have a deep golden-brown hue on top, indicating it's fully baked. If the top browns too quickly, tent the pans with aluminum foil to prevent over-browning while ensuring the center is fully cooked.
Cool and Finish the Cake
Remove the cakes from the oven and let them cool in the pans for 10 minutes. This brief cooling period allows the cakes to set slightly, making them easier to handle. Run a thin knife around the edges of the cakes to loosen them from the pans, then transfer them to a wire rack to cool completely.
Once the cakes are completely cool, you can frost with your choice of chocolate ganache or whipped cream. The deep, rich chocolate flavor of this cake pairs beautifully with a light dusting of cocoa powder or a simple glaze made from powdered sugar and milk. The espresso powder in the batter enhances the chocolate flavor, giving it a sophisticated depth that's truly impressive.
Pro Tips For Making Baker'S Unsweetened Chocolate Cake
- MELT CHOCOLATE SLOWLY: I learned this the hard way—dumping chopped baker’s chocolate into hot butter makes it seize into clumps. Instead, break the chocolate into small pieces, then lower the heat to medium-low and stir constantly until fully melted. The butter shouldn’t even look like it’s bubbling hard, or you’ll end up with grainy cake batter.
- MASH BANANAS WELL: Skip the fork—use a potato masher or fork to press the bananas through a fine-mesh sieve. This removes those stubborn banana strings that make the cake dense and gummy. Yes, it’s extra work, but your cake will actually taste like cake, not a banana pudding.
- WEIGH THE FLOUR: That scoop-and-sweep method? It’s your enemy here. Use a kitchen scale for the flour—this recipe relies on precise ratios, and overpacking it makes the cake dry. Three cups of all-purpose flour should weigh about 12 ounces (340g). No scale? Spoon the flour into the cup, then level it off with a knife.
- BAKE UNTIL SPRINGY: The cake’s done when the edges pull away from the pan and a toothpick comes out with just a few moist crumbs (not wet batter). I used to pull it out too soon because I thought it’d sink—don’t. Let it bake 2-3 minutes past your best guess, then tent with foil if the top browns too fast. Patience here means no dense, undercooked center.
Regional styles of baker's unsweetened chocolate cake
French Depth
In France, baker’s chocolate is traditionally used in cakes like this one, but they often add a touch of orange zest to complement the chocolate’s richness.
I’ve found that ½ teaspoon of orange zest in the dry ingredients adds a bright, citrusy note that cuts through the intensity of the chocolate. Pair this with a dark chocolate ganache (made with 70% Valrhona chocolate) for an authentic French-inspired finish. 🌟
Southern Comfort
Southern bakers often enhance chocolate cakes with pecans or walnuts for texture and a buttery depth. For this recipe, fold ½ cup chopped pecans into the batter during the final mixing step.
Top with a creamy bourbon caramel sauce (simmer ½ cup brown sugar, ¼ cup butter, and 2 tbsp bourbon) for a decadent Southern twist. The espresso powder in the batter pairs beautifully with the caramel’s smoky notes.
Italian Espresso Twist
Italian bakers frequently use espresso powder in chocolate desserts, and this recipe already incorporates it—but they often take it further by adding 1 teaspoon of instant coffee granules directly to the melted butter-chocolate mixture.
For an authentic Italian touch, dust the cooled cake with powdered sugar and serve with a strong cappuccino. The coffee enhances the chocolate’s complexity without overpowering it. ☕
German Spiced Version
German bakers infuse their chocolate cakes with warm spices like cardamom and cloves, which pair wonderfully with the cinnamon already in this recipe. Add ½ teaspoon ground cardamom and ¼ teaspoon ground cloves to the dry ingredients for a cozy, aromatic flavor.
Serve with a whipped cream lightly sweetened with honey instead of sugar, and garnish with crushed amaretti cookies for a crunchy contrast. 🌿
British Elegance
British bakers often create a smoother texture in their chocolate cakes by incorporating 1 tablespoon of Dutch-processed cocoa powder into the dry ingredients alongside the flour. For a refined finish, brush the cooled cake layers with raspberry jam before assembling, then top with whipped cream and fresh raspberries.
The tartness of the berries balances the deep chocolate flavor beautifully. 🍓
Nutrition facts
Frequently asked questions
Why does this recipe use baker’s chocolate instead of cocoa powder?
Baker’s unsweetened chocolate contains both cocoa solids and cocoa butter, creating a richer, more velvety texture and deeper flavor than cocoa powder alone. The fat content in baker’s chocolate also helps tenderize the cake, while cocoa powder can make it dense. For this recipe, we specifically need that extra fat and intensity to balance the natural sweetness from bananas.
Can I make this cake without ripe bananas?
Yes! Use 1 cup mashed overripe frozen bananas (thawed and drained) for extra sweetness, or substitute with 1 cup unsweetened applesauce. For a sweeter profile, add 1-2 tablespoons of maple syrup to the wet ingredients. The bananas provide natural sweetness that replaces sugar while keeping the cake moist.
How do I prevent my cake from being too dense?
Don’t overmix the batter—just combine until no flour streaks remain. Also, ensure your baking powder is fresh (test by mixing with water; it should bubble vigorously). For extra lift, whisk the eggs separately until slightly frothy before adding to the wet ingredients. A 350°F oven is critical—any hotter can cause uneven baking.
What’s the best way to store leftover cake?
Wrap tightly in plastic wrap and store at room temperature for 3 days, or refrigerate for 5 days. For longer storage, freeze slices in an airtight container for up to 3 months. To reheat, warm at 200°F for 5-10 minutes to restore the crackly top texture. The cake freezes beautifully without drying out!
Can I use this recipe for a layer cake?
Divide the batter between two 9-inch pans and bake as directed. For assembly, use a dark chocolate ganache (melt 8 oz baker’s chocolate + ½ cup heavy cream) or whipped cream. The espresso powder in the batter enhances the chocolate flavor, making it perfect for a sophisticated layered presentation.