A chocolate mud cake recipe should give you a dense, fudgy crumb that sits somewhere between a brownie and a flourless cake. This version uses melted butter and oil together so the crumb stays moist for days instead of drying out by the second day. You get a deep cocoa flavor from both unsweetened cocoa and dark chocolate, with a thin glossy top that cracks slightly as it cools.
The method is built for reliability rather than speed alone. We bloom the cocoa in hot butter, which wakes up the fat-soluble flavor compounds that cold mixing leaves dull. If you follow the pan prep and bake cues below, you’ll avoid the sunken center that ruins many home bakes. If you enjoyed this, our eggplant rollatini is worth trying next. Making this chocolate mud cake at home is surprisingly straightforward once you know the key steps.
Why You’ll Love These Chocolate Mud Cake
- Stays moist up to 4 days thanks to the oil-butter mix, not just butter alone.
- One bowl for the wet base keeps cleanup short and limits overmixing.
- Deep chocolate taste from cocoa plus melted dark chocolate, not just powder.
- Forks cleanly when warm yet slices neat when chilled for serving.
Ingredients You’ll Need
- 200 g dark chocolate (55–60% cocoa), chopped fine
- 150 g unsalted butter, cubed
- 80 ml neutral oil (sunflower or canola)
- 50 g Dutch-process cocoa powder
- 250 g caster sugar
- 3 large eggs, room temperature
- 120 g plain flour
- 1 tsp baking powder
- 0.5 tsp fine salt
- 120 ml hot water (not boiling)
- 1 tsp vanilla extract
Ingredient Substitutions
Dark chocolate: Replace with an equal weight of milk chocolate for a sweeter, softer set. Milk chocolate carries more sugar and less cocoa solids, so the baked cake will be lighter in color and a little less structured. You may cut caster sugar by 20 g to keep balance, but expect a milder cocoa note overall. The chocolate mud cake works well for weeknight cooking when time is limited.
Neutral oil: Swap with an equal volume of melted coconut oil for a firmer cold texture. Coconut oil solidifies below 24°C, so a chilled slice will feel waxy rather than tender. Keep the cake at room temperature for serving if you use this swap. Storing leftover chocolate mud cake correctly keeps it tasting good for days.
Plain flour: Use an equal weight of gluten-free 1-to-1 baking flour if needed. These blends often include xanthan gum, which holds the crumb, but the cake may rise slightly less and taste a touch starchier. Add 1 extra tbsp hot water to loosen the batter if it looks stiff. For the best results with this chocolate mud cake, read through all the steps before starting.
Caster sugar: Replace with an equal weight of light brown sugar for a deeper molasses hint. Brown sugar holds more moisture, so the top stays tacky longer and the crumb reads chewier. The color will shift from near-black to a warm brown. For another easy option, check out our home.
Step-by-Step Instructions
- Heat oven to 160°C / 320°F and line a 20 cm round tin with paper, greasing the sides well.
- Place chopped dark chocolate, butter, and oil in a bowl over medium-low heat, stirring until smooth and glossy with no lumps.
- Whisk in cocoa powder and hot water until the mix thickens to a loose paste, then let it cool for 5 minutes.
- Beat eggs, sugar, and vanilla in a second bowl for 2 minutes until pale and slightly thickened.
- Fold the chocolate base into the egg mix, then sift in flour, baking powder, and salt; stir until just combined and do not overmix.
- Pour into the tin and bake 40–45 minutes until the top is set and a skewer shows moist crumbs, not wet batter.
- Cool in the tin for 25–30 minutes before lifting out; the center will finish setting as it rests.
Pro Tips
Room-temperature eggs whip to a stable foam faster, which supports the low-rise crumb so it doesn’t collapse. Pull them from the fridge 30 minutes before you start the wet base.
Use a metal skewer rather than a thin toothpick; the thicker shaft shows true crumb moisture instead of smearing the batter. You want a few damp specks, never a clean pull.
For a sharper top crack, cool the cake on a rack outside the tin after the first rest. A slow drop in temperature stresses the thin crust just enough for clean lines.
Read technique notes from simple baking guides if you want to compare cocoa blooming methods before scaling this batch.
Common Mistakes to Avoid
Opening the oven before minute 35 lets cool air hit the fragile top and causes a central dip. Keep the door shut and trust the timer until the final check.
Using boiling water instead of hot water can scramble the cocoa slurry and make the batter grainy. Aim for steaming but not bubbling liquid straight from the kettle.
Overbeating after flour goes in builds gluten and turns the mud cake rubbery instead of dense-soft. Stop folding once no white streaks remain. You might also like our image.
Serving Suggestions
Slice the cake cold with a warm knife for clean edges, then plate with a spoon of fudgy chocolate cake crumbs beside it. A scoop of vanilla ice cream melts into the cracks within a minute.
For a plated dessert, dust with cocoa and add gin cocktail pairings on the side for adults. The bitter cocoa balances a sweet citrus drink well.
Storage and Reheating
Wrap the cooled cake in foil and keep it in an airtight container in the fridge for up to 4 days. The crumb firms cold but softens within 20 minutes at room temperature.
You can freeze the whole cake or single slices for freeze for up to 2 months in a sealed bag. Thaw overnight in the fridge, then warm a slice at 150°C / 300°F for 8 minutes to serve lightly warm.
Don’t leave a cut cake on the counter beyond 2 hours in warm rooms, since the oil and egg content spoils faster than a dry sponge.
Recipe Variations
Orange Peel Version
Add 2 tsp finely grated orange zest to the egg mix and swap the hot water for weak orange tea. The citrus lifts the cocoa without making the cake taste like candy, and the crumb stays identical in density.
Salted Caramel Swap
Pour 3 tbsp thick caramel sauce over the batter before baking so it sinks into pockets. Use a soft pasta spoon to swirl once, then bake as written for a gooey center.
Espresso Boost
Stir 1 tbsp instant espresso into the hot water to deepen the chocolate read. The cake won’t taste like coffee but will show more roasted notes; keep all other amounts the same for a reliable set.
Nut Crunch Top
Scatter 40 g chopped toasted hazelnuts on top at minute 30 of baking so they stick without burning. The added fat means the top stays a little tacky, so cool fully before slicing with a takeout tool knife.
Chocolate Mud Cake
Description
A chocolate mud cake with a dense, fudgy crumb between a brownie and flourless cake, kept moist for days by a butter-oil mix.
Deep cocoa flavor comes from bloomed cocoa and melted dark chocolate with a thin glossy top that cracks as it cools.
Ingredients
Instructions
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Heat oven and prep tin
Heat the oven to 160°C / 320°F using a conventional setting so the low gentle heat sets the crumb without cracking early. Line a 20 cm round tin with paper and grease the sides well so the cake releases after resting without tearing the thin top.
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Melt chocolate base
Place the chopped 200 g dark chocolate, 150 g cubed unsalted butter, and 80 ml neutral oil in a bowl over medium-low heat, stirring until smooth and glossy with no lumps. This combined fat base keeps the crumb moist for days rather than drying by the second day.
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Bloom cocoa paste
Whisk in the 50 g Dutch-process cocoa powder and 120 ml hot water (not boiling) until the mix thickens to a loose paste that looks satin and smells roasted. Let it cool for 5 minutes so the eggs won't scramble when folded in later.
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Beat egg foam
Beat the 3 large room-temperature eggs, 250 g caster sugar, and 1 tsp vanilla extract in a second bowl for 2 minutes until pale and slightly thickened like a soft ribbon. Room-temperature eggs whip to a stable foam faster, supporting the low-rise crumb so it doesn't collapse.
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Combine batter
Fold the chocolate base into the egg mix gently, then sift in 120 g plain flour, 1 tsp baking powder, and 0.5 tsp fine salt; stir until just combined and no white streaks remain. Stop folding once blended because overmixing builds gluten and turns the mud cake rubbery instead of dense-soft.
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Bake cake
Pour the batter into the prepared tin and bake at 160°C / 320°F for 40–45 minutes until the top is set and a metal skewer shows moist crumbs, not wet batter. Keep the oven door shut until minute 35 so cool air doesn't cause a central dip in the fragile top.
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Cool in tin
Cool the cake in the tin for 25–30 minutes before lifting out, during which the center finishes setting as it rests. For a sharper top crack, after this rest move it to a rack outside the tin so a slow temperature drop stresses the thin crust into clean lines.
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Serve or store
Slice the cake cold with a warm knife for clean edges, or serve warm where it forks cleanly from the center. Wrap cooled cake in foil and refrigerate in an airtight container for up to 4 days, as the oil and egg content spoils faster than a dry sponge if left out.
Nutrition Facts
Servings 10
- Amount Per Serving
- Calories 420kcal
- % Daily Value *
- Total Fat 25g39%
- Saturated Fat 12g60%
- Cholesterol 65mg22%
- Sodium 200mg9%
- Total Carbohydrate 45g15%
- Dietary Fiber 3g12%
- Sugars 32g
- Protein 6g12%
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.
Note
- Storage: Wrap the cooled cake in foil and keep in an airtight container in the fridge for up to 4 days; don't leave a cut cake on the counter beyond 2 hours in warm rooms.
- Reheating: Warm a slice at 150°C / 300°F for 8 minutes after thawing overnight in the fridge, and never reheat the same portion more than once.
- Pro tip: Pull eggs from the fridge 30 minutes before starting so they whip to a stable foam and support the low-rise crumb; compare methods in fudgy chocolate cake notes if scaling.
- Pan prep: Grease the sides of the 20 cm tin well and line with paper to avoid a sunken center and torn top on release.
