This 1 lb black cake recipe delivers rich, fudgy layers infused with rum that keep it moist for days. ⚡ The secret lies in precise ingredient ratios—dark cocoa powder, espresso powder, and brown sugar create deep chocolate intensity, while rum adds warmth without overpowering. I’ve perfected this version to yield a dense, single-serving cake that’s perfect for holidays or special occasions.
The baking process is straightforward but requires attention to detail: a 350°F oven for 45-50 minutes ensures even baking without drying out. The cake’s signature texture comes from combining melted butter with sour cream and eggs at room temperature, creating a tender crumb that stays moist long after baking. This isn’t your typical dry cake—it’s a decadent treat with a velvety finish.
What sets this black cake apart is its rum-infused moisture, which develops during the baking process and intensifies as it cools. The aroma alone—deep chocolate with hints of caramel and spice—will fill your kitchen, making it impossible to resist slicing a piece while still warm. Each bite delivers that perfect balance of fudgy richness and subtle boozy depth.
Serve it with whipped cream, chocolate ganache, or a dusting of powdered sugar for a restaurant-worthy dessert. The cake keeps well at room temperature for up to 5 days, making it ideal for gifting or meal prep. Let’s bake this showstopper!
Ingredients for 1 lb black cake
Rich cocoa, deep rum, and velvety butter create this decadent single-serving cake’s signature moisture.
| Ingredient | Amount | Notes |
|---|---|---|
| Unsalted Butter 🧈 | ½ cup | Melted, room temperature |
| Dark Brown Sugar 🍚 | 1 cup | Packed, not light brown |
| Granulated Sugar 🍚 | ½ cup | For balanced sweetness |
| Dark Cocoa Powder 🍫 | ½ cup | Dutch-processed preferred |
| Espresso Powder ☕ | 2 tbsp | Enhances chocolate depth |
| All-Purpose Flour 🌾 | ¾ cup | Sifted for light texture |
| Baking Powder 🍞 | ½ tsp | Aluminum-free preferred |
| Salt 🧂 | ¼ tsp | Fine sea salt |
| Large Eggs 🥚 | 2 whole | Room temperature |
| Sour Cream 🍦 | ½ cup | Full-fat for moisture |
| Dark Rum 🍹 | ¼ cup | Aged 4+ years preferred |
| Vanilla Extract 🌸 | 1 tsp | Pure Madagascar preferred |
| Powdered Sugar 🍚 | ¼ cup | For dusting, optional |
| Chocolate Ganache 🍫 | ½ cup | For topping, optional |
The cocoa and rum are non-negotiable for that signature flavor. Ghirardelli or Valrhona cocoa powder delivers the deepest chocolate flavor—don’t skimp on quality here. For rum, Captain Morgan or Appleton Estate are my go-tos, but any aged dark rum works. The butter needs to be unsalted and room temperature—cold butter creates dense layers. If you can’t find dark brown sugar, mix 1/3 cup molasses with 2/3 cup light brown sugar for that caramel depth. The espresso powder is key—it enhances the chocolate flavor without tasting like coffee.
No dark cocoa powder? Natural cocoa powder plus 1 tsp instant coffee gets you close. Running out of rum? 1/4 cup bourbon or brandy works in a pinch, though the flavor will be slightly different. The sour cream adds moisture but can be swapped for Greek yogurt at half the amount. For the ganache topping, Trader Joe’s dark chocolate squares melt beautifully with heavy cream. If you’re dusting with powdered sugar, sift it through a fine mesh sieve for that professional finish. The cake can be made ahead—just bake it a day early and store it wrapped in plastic.
This cake keeps beautifully at room temperature for up to 5 days when properly wrapped. For longer storage, freeze individual portions wrapped in plastic wrap for up to 3 months. I like to slice it into 1-pound portions right after baking so each serving is perfect. The rum flavor actually intensifies as it sits, so it tastes even better the next day. Serve with a dollop of whipped cream or a drizzle of chocolate ganache for that restaurant-worthy presentation.
Why You’ll Love This Recipe
- One-Bowl Wonder: I swear by this recipe when I’m in a rush—just cream the butter and sugars, toss in the dry stuff, and let the oven do the work. No extra mixing bowls, no fuss, and honestly? That’s my kind of baking.
- Deep Chocolate Magic: The combo of dark cocoa and espresso powder gives it this rich, almost fudgy depth you won’t find in regular cake. It’s not too sweet, not too bitter—just perfectly balanced, like a hug in dessert form.
- Weeknight or Celebration: Slice it warm for dinner with vanilla ice cream, or bake it ahead for birthdays. Between us, I’ve even used it as a base for cheesecake filling (yes, really). One recipe, endless possibilities.
- Budget-Friendly Luxury: A pound of cake feeds a crowd or lasts me days of after-dinner treats. The ingredients are simple—no fancy add-ins—but the flavor? That’s the real splurge. My wallet thanks me every time.
Step-by-step instructions for rich chocolate cake with rum infusion
Let’s create a lusciously moist cake where every bite delivers deep chocolate flavor and rum-kissed richness.
👨🍳 Step 1: Mix Wet Ingredients for Maximum Moisture
In a large mixing bowl, combine the 0.5 cup melted unsalted butter with both sugars (1 cup dark brown sugar and 0.5 cup granulated sugar). Whisk until fully incorporated and the mixture looks smooth and glossy. This is where the magic starts—the butter and sugars create the foundation for that tender crumb we’re after.
Next, add the 0.5 cup sour cream and 0.25 cup dark rum. The rum adds depth and moisture while infusing that subtle caramel note. Stir well, then add the 1 teaspoon vanilla extract and 2 tablespoons espresso powder. The espresso enhances the chocolate flavor without making the cake taste like coffee. Mix until all ingredients are fully combined and the batter looks rich and velvety.
👨🍳 Step 2: Combine Dry Ingredients and Fold Gently
In a separate bowl, sift together the 0.75 cup all-purpose flour, 0.5 teaspoon baking powder, 0.25 teaspoon salt, and 0.5 cup dark cocoa powder. This sifting step ensures a light texture by preventing lumps. Create a well in the center of the dry ingredients and make sure your bowl is ready for the next step.
With the mixer on low speed, gradually add the dry ingredients to the wet mixture. Mix just until combined—you should still see some flour streaks. Overmixing develops gluten, which can make the cake tough. The goal here is to create a thick, smooth batter that’s just combined. Scrape down the sides of the bowl to ensure everything is evenly incorporated.
🍳 Step 3: Add Eggs and Mix Until Just Combined
Add the 2 whole large eggs, one at a time, mixing on low speed after each addition. The eggs add structure and richness to the cake. After adding both eggs, mix for an additional 30 seconds to ensure they’re fully incorporated. The batter should now be thick and glossy—almost like a rich chocolate pudding.
Here’s the thing—don’t overmix. You want to maintain that tender crumb texture. The batter should be thick enough to leave a trail when you lift the whisk, but still smooth. If it looks too thin, you might have overmixed or your ingredients weren’t at room temperature. This is the perfect consistency for our moist cake.
⏰ Step 4: Bake at Low Temperature for Even Cooking
Preheat your oven to 350°F and prepare a 9-inch round cake pan by greasing it thoroughly with butter and dusting with flour. Pour the batter into the prepared pan and smooth the top with a spatula. Bake for 35-40 minutes until a toothpick inserted into the center comes out clean and the edges are set but the center still has a slight bounce.
I know it seems counterintuitive, but we’re going for a slightly underbaked center. This ensures maximum moisture as the cake cools. The rum and sour cream in the batter mean we need to be careful not to overbake. If the top starts to brown too quickly, tent the cake with aluminum foil to prevent overbrowning while still allowing it to cook through.
🍽️ Step 5: Cool and Top for Ultimate Decadence
Remove the cake from the oven and let it cool in the pan for 10 minutes. Then transfer it to a wire rack to cool completely. This gradual cooling process helps the cake set properly and prevents cracking. While it cools, prepare the optional toppings if using.
For the ultimate presentation, dust the cooled cake with 0.25 cup powdered sugar and drizzle with the 0.5 cup chocolate ganache. The ganache should be slightly warmed to make it easier to drizzle. Serve slices immediately or store covered at room temperature for up to 3 days. Each slice should be rich, moist, and packed with that deep chocolate flavor enhanced by the rum infusion.
Pro Tips For Making 1 Lb Black Cake
- WEIGH THE COCOA: Mix the cocoa powder into the dry ingredients first—don’t just dump it in with the wet. I learned this the hard way when my cake turned grainy; sifting it in prevents clumps, especially with dark cocoa, which loves to stick together.
- CREAM THE BUTTER SLOW: Let the butter and sugars sit at room temperature for 30 minutes before mixing. Cold butter makes for a dense cake, and you’ll end up overmixing, which introduces air you don’t want in a black cake. Trust the process—your future self will thank you.
- DON’T OVERBAKE THE EDGES: Check for doneness at 15 minutes before the recipe’s suggested time. Black cake dries out fast, and overbaking turns the edges tough while the center stays moist. A toothpick with moist crumbs (not wet batter) is perfect—yes, even if it looks underdone.
- SWAP ESPRESSO FOR INSTANT: If you don’t have espresso powder, use 1 tablespoon of instant coffee granules dissolved in 2 tablespoons hot water, then cooled. It’s the same deep flavor without the hassle of grinding beans—just don’t skip the cooling step or your butter will seize up.
Perfect pairings for this 1 lb black cake
Creamy Pairings
Whipped cream is the classic choice—lightly sweetened with ½ cup heavy whipping cream and a pinch of vanilla. I like to whip it to soft peaks and dollop it right on top of each slice. For extra decadence, fold in 1 tbsp powdered sugar and a splash of rum (just ½ tsp) to echo the cake’s flavor. The creaminess contrasts beautifully with the dense, fudgy texture of the black cake. 🥛
Chocolate Ganache
The ½ cup chocolate ganache mentioned in the recipe is perfect for drizzling over slices. Melt ½ cup dark chocolate chips (70% cocoa or higher) with ¼ cup heavy cream over a double boiler, then let it cool slightly before drizzling. For a richer version, add 1 tbsp butter to the ganache. This adds a glossy finish and intensifies the chocolate flavor, making each bite even more indulgent.
Coffee Liqueur
Serve slices with a small glass of Kahlúa coffee liqueur or a shot of espresso to enhance the chocolate and rum flavors. The coffee complements the espresso powder in the cake, while the liqueur adds a smooth, slightly sweet finish. I like to pair it with a 1-ounce pour—just enough to balance the richness without overwhelming the dessert. ☕
Spiced Whipped Cream
For a sophisticated twist, infuse your whipped cream with spices. Warm ½ cup heavy cream with ½ tsp cinnamon and ¼ tsp cardamom (optional) for 10 minutes, then chill and whip to stiff peaks. The spices add warmth that pairs beautifully with the rum and chocolate. This version feels especially festive for holiday gatherings.
Fruit Contrast
Bright, acidic fruits cut through the richness of the cake. I love serving slices with raspberries or blackberries, which add a pop of color and a tart contrast. Arrange them in a circular pattern on the plate to create a visually stunning presentation. The berries also balance the sweetness, making each bite more dynamic.
Warm Rum Sauce
Heat ½ cup heavy cream with 2 tbsp brown sugar, 1 tbsp dark rum, and 1 tsp vanilla extract until steaming. Let it cool slightly and drizzle over cake slices. This sauce adds an extra layer of rum flavor and a silky texture that complements the cake’s fudgy interior. It’s especially impressive when served warm, straight from the saucepan. 🍹
Nutrition facts
Frequently asked questions
Can I make this recipe without rum?
Replace the 0.25 cup dark rum with 0.25 cup apple juice or orange juice for moisture. For depth, add 1 teaspoon vanilla extract and ½ teaspoon almond extract. The cake will still be moist but lose the boozy warmth. The rum enhances flavor but isn’t essential for the texture.
Why does my cake turn out dry?
Dryness usually means overbaking or cold ingredients. Bake until a toothpick comes out with moist crumbs (not clean). Ensure your butter and eggs are room temperature, and don’t exceed 40 minutes at 350°F. For extra moisture, brush the cooled cake with 2 tablespoons simple syrup (equal parts sugar + water, heated until dissolved).
How do I adjust this for a 9×13-inch pan?
Double the recipe for a 9×13-inch pan, but bake at 325°F for 50-55 minutes. The larger surface area requires lower heat to prevent overbrowning. Grease the pan thoroughly and line with parchment paper for easy removal. Divide the batter evenly—this cake is dense and shouldn’t be spread too thin.
Can I use this cake for a wedding dessert?
Yes! This cake’s rich, single-serving portions make it perfect for wedding desserts. Serve it on a wooden board with gold leaf accents and fresh berries. For a booze-free version, replace rum with orange liqueur or vanilla syrup**. Pair with spiced whipped cream for an elegant touch. Just avoid baking more than 24 hours ahead—it’s best served fresh.
What’s the best way to store leftovers?
Wrap cooled slices tightly in plastic wrap and store at room temperature for up to 5 days. For longer storage, freeze individual portions in airtight containers for 3 months. Thaw overnight in the fridge. The rum flavor actually improves as it sits, so leftovers often taste even better the next day!
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