One-Bowl Chocolate Loaf Cake
A loaf cake that tastes like your favorite bakery brownie in sliceable form. This one-bowl chocolate loaf cake is rich, deeply fudgy, and made with everyday ingredients you likely already have in the pantry.
No mixer, no fuss. Stir everything together in a single bowl, pour it into a pan, and let the oven do the work. The top cracks just like a brownie, and the crumb stays moist for days.
What Makes This Chocolate Loaf Cake So Good
The texture lands somewhere between a dense chocolate pound cake and a tender snack cake. It has a soft, velvety crumb that holds its shape when sliced but still feels almost silky on your tongue.
A generous amount of cocoa powder and hot coffee builds the kind of dark chocolate flavor you taste in a real chocolate shop. Oil and buttermilk keep it moist without weighing it down. No creaming butter, no folding egg whites, no stress.
That single bowl method means fewer dishes and a quicker cleanup. The batter takes about 10 minutes to stir together, and then you just wait for that cocoa scent to fill the kitchen.
Ingredients
- 1 ¾ cups all-purpose flour: spooned and leveled, not scooped
- ¾ cup unsweetened cocoa powder: Dutch-process gives a darker, smoother flavor, but natural cocoa works too
- 1 cup granulated sugar
- ½ cup packed light brown sugar: adds moisture and a hint of caramel
- 1 teaspoon baking powder
- ½ teaspoon baking soda
- ½ teaspoon fine sea salt
- 2 large eggs: at room temperature for the smoothest batter
- ½ cup vegetable oil: or any neutral oil like canola or grapeseed
- 1 cup buttermilk: well-shaken, room temperature if you have time
- 2 teaspoons vanilla extract
- ½ cup hot brewed coffee: hot water works in a pinch, but coffee deepens the chocolate
- ¾ cup semisweet chocolate chips: plus a small handful for scattering on top
Variations / Substitutions
- Use hot water instead of coffee: the cake will still be deeply chocolatey, just a shade less complex
- Swap the buttermilk for sour cream: use full-fat sour cream thinned with a tablespoon of milk so it pours easily
- Add chopped nuts: fold in ½ cup toasted walnuts or pecans with the chocolate chips
- Go dairy-free: replace the buttermilk with 1 cup unsweetened almond milk mixed with 1 tablespoon lemon juice, and use dairy-free chocolate chips
- Use browned butter: swap the oil for ½ cup melted unsalted butter (cooled slightly) for a nuttier, richer base
Chocolate Protein Overnight Oats go perfectly with this cake for an easy brunch spread.
How to Make One-Bowl Chocolate Loaf Cake
Step 1: Whisk the Dry Ingredients
In a large mixing bowl, whisk together the 1 ¾ cups flour, ¾ cup cocoa powder, 1 cup granulated sugar, ½ cup brown sugar, 1 teaspoon baking powder, ½ teaspoon baking soda, and ½ teaspoon salt. Break up any lumps of brown sugar with your fingers if needed.
The mixture will look dusty and pale brown with darker flecks of cocoa. Taking a minute to whisk well here prevents pockets of baking soda later.
Step 2: Add the Wet Ingredients
Pour the 2 eggs, ½ cup oil, 1 cup buttermilk, and 2 teaspoons vanilla directly into the dry mixture. Pour in the ½ cup hot coffee, then whisk everything together just until no dry streaks remain. Stop as soon as the flour disappears; a few small lumps are fine.
The batter will be quite thin, almost like a thick pancake batter. That’s exactly what you want. Overmixing at this stage can make the cake tough, so keep the whisk moving gently.
Step 3: Fold in the Chocolate Chips
Switch to a rubber spatula and fold in the ¾ cup chocolate chips with a few broad sweeps. Scrape the bottom of the bowl to catch any unmixed pockets.
The chips will settle into the batter, ready to melt into tiny fudgy pockets as the cake bakes. The aroma of cocoa and vanilla should be strong by now.
Step 4: Bake the Cake
Scrape the batter into a greased 9×5-inch loaf pan lined with parchment paper (leave a little overhang for easy lifting). Sprinkle the reserved handful of chocolate chips on top. Bake in a preheated 350°F (175°C) oven for 50 to 60 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs attached.
The loaf will rise and develop a shiny, crackly top. Start checking at the 50-minute mark. If the top browns too quickly, tent it loosely with foil after 35 minutes. The kitchen will smell like a chocolate factory, and the center should feel firm when you lightly press it.
Step 5: Cool and Slice the Cake
Let the loaf cool in the pan on a wire rack for 10 minutes, then lift it out using the parchment overhang and cool completely before slicing. Once fully cooled, use a serrated knife to cut thick slices.
The crumb will be tender and damp to the touch, with ribbons of melted chocolate throughout. Serve the slices as they are, or dust them with a little powdered sugar if you want a finished look. The cake is even better the next day, if you can wait.
Tips for the Best Chocolate Loaf Cake
- Bring your eggs and buttermilk to room temperature if you can. Cold buttermilk can seize the oil and make the batter less uniform. If you’re short on time, place the eggs in a bowl of warm water for 5 minutes and microwave the buttermilk in 10-second bursts until just cool, not hot.
- Line the pan with parchment paper even if you grease it. The cake sticks to the corners otherwise. A little overhang on the long sides makes lifting the baked loaf out effortless.
- Toast the nuts before folding them in if you add any. Spread them on a baking sheet and warm in the 350°F oven for 5 to 7 minutes, until fragrant. Let them cool slightly before mixing into the batter.
- Use good cocoa powder. Dutch-process cocoa gives a rounder, less acidic flavor, but natural cocoa powder works too. The cake will taste as good as the cocoa you use.
Bake times can vary by pan size:
| Pan size | Bake time |
|---|---|
| 9×5-inch loaf pan | 50–60 minutes |
| 8.5×4.5-inch loaf pan | 55–65 minutes |
Storing and Keeping Chocolate Loaf Cake Fresh
- Room temperature: Wrap the cooled loaf tightly in plastic or store in an airtight container for up to 3 days. The cake stays moist and gets even more chocolatey as it rests.
- Refrigerate: Wrap well and refrigerate for up to a week. Let slices come to room temperature before eating, or warm them briefly.
- Freeze: Wrap the whole cooled loaf or individual slices in plastic and then foil. Freeze for up to 2 months. Thaw overnight in the fridge or on the counter for a few hours.
What to Serve With Chocolate Loaf Cake
A thick slice is satisfying on its own with a cup of coffee or a glass of cold milk. When you want something extra, mound on some softly whipped cream and a handful of fresh raspberries. The tart berries cut through the richness, and the cream echoes the cake’s tender crumb. A scoop of good vanilla ice cream on the side is never a bad idea, either.
Frequently Asked Questions
Why did my cake sink in the middle?
The most common culprit is underbaking. Even if the toothpick comes out clean, the center may not be fully set. Make sure the toothpick has a few moist crumbs, not wet batter, and avoid opening the oven door before the 45-minute mark.
Can I use whole wheat flour?
Yes, but the cake will be denser and a bit drier. For the best texture, replace only half of the all-purpose flour with whole wheat pastry flour, or use white whole wheat flour for a lighter result.
Can I make this cake dairy-free?
Absolutely. Use the dairy-free buttermilk swap from the Variations section (almond milk with lemon juice), stick with vegetable oil, and choose dairy-free chocolate chips. The cake will still be moist and deeply chocolatey.
Can I add orange zest?
Yes, the brightness of orange pairs beautifully with chocolate. Add the finely grated zest of one large orange to the wet ingredients. A few drops of orange oil or extract can boost the flavor without adding moisture.
Chocolate Loaf Cake Recipe
Ingredients
Method
- Whisk flour, cocoa, both sugars, baking powder, baking soda, and salt in a large bowl.
- Add eggs, oil, buttermilk, vanilla, and hot coffee. Whisk until just combined; a few lumps are fine.
- Fold in ¾ cup chocolate chips with a spatula.
- Pour batter into a greased 9×5-inch loaf pan lined with parchment. Top with extra chocolate chips. Bake at 350°F (175°C) for 50 to 60 minutes, until a toothpick has moist crumbs.
- Cool in the pan 10 minutes, lift out, cool completely, then slice.
Notes
