A Dense and Moist Chocolate Fudge Cake for the Weekend
Mixing boiling hot water right into the batter wakes up the cocoa and brings out the big flavor of this Chocolate Fudge Cake.

Hot water wakes up the cocoa powder when you mix it directly into the batter. This technique forms the base of A Dense and Moist Chocolate Fudge Cake for the Weekend. A simple dark chocolate ganache coats the outside, and the whole recipe yields 12 large slices.
The chocolate and cocoa
Opting for semisweet or dark baking chips provides the best color, texture, and taste for the dessert. Standard eating chocolate carries a heavy consistency that prevents it from melting properly into the batter. You can substitute high-quality chopped block chocolate in place of the chips. Using a cocoa powder treated with the Dutch process creates a deeper flavor compared to standard unsweetened types.
Mixing the batter
You melt the butter and chocolate chips together in a glass or ceramic bowl. The chocolate melts evenly if you heat the dish in the microwave in 30-second intervals. You must mix the contents after each interval to distribute the heat. You stir the vegetable oil, vanilla extract, and white sugar into that hot chocolate mixture once it looks smooth. That specific step lowers the temperature of the hot batter so the room-temperature eggs do not cook when they hit the bowl. Brown sugar works as a direct replacement for the white sugar if you prefer.
Adding the dry ingredients and water
Sift one cup of all-purpose flour, one teaspoon of baking powder, and a quarter cup of cocoa powder through a fine mesh sieve directly over the wet mixture. You can easily swap the plain flour and baking powder for a flour that already contains a leavening agent. Finish this stage by pouring one cup of boiling hot water straight into the bowl.
The hot liquid blooms the dry cocoa and enhances the chocolate flavor. You can swap the hot water for one cup of hot coffee to deepen the chocolate flavor. You mix the batter gently until the water combines. The finished mixture will look thin, and you can ignore a few minor lumps.
Baking the cake
You coat a 9-inch (22 cm) springform pan with grease and line the bottom with baking paper. You pour the thin batter directly inside the pan until the bottom is covered. The cake bakes for one hour in a 300°F (150°C) oven on standard settings, or a 265°F (130°C) oven on a fan setting. You check the center at the 50-minute mark. The top will split open as it bakes. A wooden test stick pushed into the center should pull out damp, but it should not have wet batter attached to it. The baked cake must drop in temperature completely on a wire cooling rack before you handle it. You will tear the delicate crumb if you remove the bottom metal plate from a warm cake.
The heavy cream ganache
This frosting requires exactly 8 oz (250 g) of dark chocolate chips and one cup of heavy or thickened cream. The dairy must contain a minimum of 30 percent fat so the mixture sets properly. Choosing a low-fat option or a non-whippable pouring cream guarantees a runny liquid rather than a thick topping. Swapping the dark chips for milk or white varieties using the same ratio creates a coating that will not set firmly. Anyone making this in Japan must weigh the components because local measuring cups hold less volume than standard sizes.
Setting the frosting
Put the remaining dark chocolate chips and the heavy cream into another microwave-safe dish. Heat the ingredients using 30-second bursts, making sure the cream never boils. Boiling the dairy stops the ganache from forming properly. Stir the warm liquid until it looks entirely smooth, and then chill the bowl in the refrigerator for 1 to 2 hours. The chocolate topping is ready to smear once it thickens to feel like a heavy nut butter. If the mixture becomes overly hard from chilling too long, warming it in the microwave for a 10-second interval makes it spreadable again.
Decorating and storage
You coat the top and edges of the cooled baked cake with the thick frosting.
You drag a teaspoon over the outside in circular motions to create a textured finish.
You can cut and serve the dessert immediately. Chilling the decorated cake in the refrigerator for a few hours causes the topping to become firm, taking on a texture similar to a solid truffle.
A Dense and Moist Chocolate Fudge Cake for the Weekend
Ingredients
- 2 room-temperature eggs
- 4 oz dark chocolate chips
- 1.25 cup white sugar, preferably caster or superfine
- 0.25 cup cocoa powder
- 1 cup all-purpose or plain flour
- 1 tsp baking powder
- 0.25 cup vegetable or canola oil
- 1 cup boiling hot water
- 7 tbsp salted butter, or unsalted butter plus 0.25 tsp salt
- 1 tsp vanilla extract
- 1 tbsp coffee granules, optional
Ganache
- 8 oz dark chocolate chips
- 1 cup heavy or thickened cream, at least 30% fat
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Method
Ganache
Substitutions
You can swap the white sugar for brown sugar, or use a cup of hot coffee instead of the hot water to deepen the chocolate flavor.
Using a Dutch cocoa instead of standard unsweetened cocoa powder provides a deeper chocolate flavor.
Storage
Chilling the ganache in the refrigerator for one to two hours creates a firm truffle consistency. If the frosting gets too stiff, you can easily soften it for spreading by microwaving the bowl for 10 seconds.
Serving
A Dense and Moist Chocolate Fudge Cake for the Weekend yields twelve large slices.
Common mistakes
Avoid substituting milk or white chocolate using the same ganache ratio because the frosting will not set firmly.
Do not let the cream boil or use a product with less than 30 percent fat, as both will prevent the ganache from setting properly.
Taking the base of the springform pan off before the cake cools completely will cause the delicate crumb to tear.
Techniques
Mixing the oil, vanilla, and sugar into the hot melted chocolate lowers the batter temperature so the raw eggs do not scramble when added.
Sifting cocoa powder directly over the bowl prevents stubborn lumps from forming in your wet batter.
Always insert a wooden skewer into the thickest part of baked goods to test for doneness, looking for moist crumbs rather than wet batter.
- Store
- Chilling the ganache in the refrigerator for one to two hours creates a firm truffle consistency. If the frosting gets too stiff, you can easily soften it for spreading by microwaving the bowl for 10 seconds.
Can I use a regular chocolate bar instead of chocolate chips?
High-quality chopped block chocolate serves as a direct replacement for the dark chocolate chips. Skip standard eating chocolate, as it is excessively dense and fails to melt correctly into the mixture.
Can I swap the all-purpose flour and baking powder for a flour that already contains a rising agent?
You can substitute the all-purpose or plain flour with self-rising flour. Just remember to skip adding the teaspoon of baking powder to the batter.
Why is my chocolate frosting so runny?
The frosting will not set properly if you use a cream with less than 30 percent fat or if you allow the heavy cream to boil while heating. Using milk chocolate or white chocolate instead of dark chocolate chips will also ruin the consistency because they require different liquid ratios to set.
Why do I need to add the oil and sugar before the eggs?
Mixing the vegetable oil, vanilla extract, and white sugar into the melted chocolate cools the hot mixture down. This lowers the batter temperature so the raw eggs do not scramble when they are added to the bowl.
How do I know when my baked goods are fully cooked in the center?
Always insert a wooden skewer into the thickest part of your baked goods to test for doneness. You are looking for the stick to pull out with moist crumbs rather than completely wet batter.
Why is it important to sift cocoa powder?
Sifting dry ingredients directly over the bowl breaks up clumped particles before they hit the liquid. This simple step prevents stubborn lumps from forming in your wet batter.
What happens if I leave the frosted cake in the refrigerator?
Placing the cake in the refrigerator causes the ganache to harden into a firm truffle consistency. Should the bowl of frosting become too stiff to use while chilling, heating it for 10 seconds in the microwave brings back a spreadable texture.
How many slices does this cake make?
A Dense and Moist Chocolate Fudge Cake for the Weekend yields 12 large slices.
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