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Chocolate fudge cake recipe whole cake with thick, rustic frosting swirls on a ceramic pedestal stand with raspberries and milk.

Chocolate Fudge Cake

This Chocolate Fudge Cake is sinfully moist, deeply fudgy, and made in one bowl — no mixer required. The secret? Boiling coffee + Dutch process cocoa + oil instead of butter. Stays moist for days, never dry, and topped with a glossy chocolate fudge frosting that tastes like a bakery dream. The only chocolate cake recipe you will ever need.
Print Recipe Pin Recipe
Prep Time 25 minutes
Cook Time 35 minutes
Cooling Time 1 hour
Total Time 2 hours
Servings: 10 slices
Course: Dessert, Snack
Cuisine: American
Calories: 485
Ingredients Equipment Method Notes

Ingredients
  

For the Chocolate Fudge Cake Layers
  • 2 cups All-purpose flour 250g — spooned and leveled, not packed
  • 2 cups Granulated sugar 400g — or use 1 cup white + 1 cup brown sugar for extra moisture
  • ¾ cup Dutch process cocoa powder 75g — sifted — NOT natural cocoa (see Notes)
  • 2 tsp Baking soda
  • 1 tsp Baking powder Make sure it is fresh
  • 1 tsp Salt
  • 2 Large eggs Room temperature
  • `1 cup Buttermilk 240ml — room temperature (see Notes for substitute)
  • 1 cup Vegetable oil 240ml — or canola, sunflower — any neutral oil
  • 2 tsp Pure vanilla extract
  • 1 cup Boiling strong coffee 240ml — or boiling water — coffee intensifies chocolate flavor
For the Chocolate Fudge Frosting
  • 1 cup Unsalted butter 225g — fully softened to room temperature
  • ½ cup Heavy cream 120ml — also called double cream or whipping cream
  • ¾ cup Dutch process cocoa powder 75g — sifted
  • 3 cups Powdered sugar 360g — also called icing sugar or confectioner's sugar — sifted
  • 1 tsp Pure vanilla extract
  • 1 pinch Salt Balances the sweetness
  • 4 oz Dark chocolate (60–70% cocoa) 115g — melted and cooled to room temperature

Equipment

  • 2 8-inch round cake pans Or 9-inch — line with parchment paper
  • 1 Large Mixing Bowl For dry and wet ingredients
  • 1 Medium Mixing Bowl For wet ingredients
  • 1 Electric hand mixer Or stand mixer — whisk also works for batter
  • 1 Wire Cooling Rack For cooling cake layers
  • 1 Offset spatula For frosting — makes smooth application easy
  • 1 Sifter or fine mesh sieve For sifting cocoa powder and powdered sugar
  • 1 Parchment Paper To line cake pan bottoms
  • 1 Toothpick For testing doneness
  • 1 Cake board or serving plate For assembling finished cake

Method
 

Prep
  1. Preheat oven to 350°F (175°C). Grease two 8-inch round cake pans. Line the bottoms with parchment paper circles, then grease the parchment. Set aside.
    Chocolate fudge cake recipe step showing hands placing round parchment paper into greased metal baking pans on a wooden counter.
  2. Brew a strong cup of coffee and bring to a boil just before adding to batter. If using boiling water instead, bring water to a full boil.
    Chocolate fudge cake recipe step showing a glass measuring cup filled with steaming hot brewed coffee on a wooden kitchen counter.
  3. Make sure all refrigerated ingredients — eggs, buttermilk — are at room temperature before starting.
    Chocolate fudge cake recipe step showing room temperature eggs in a ceramic bowl and a glass bottle of buttermilk on a wooden table.
Make the Cake Batter
  1. In a large bowl, whisk together the flour, sugar, Dutch process cocoa powder, baking soda, baking powder, and salt. Whisk thoroughly for a full 30 seconds to ensure there are no lumps. Sift the cocoa if it has any clumps.
    Chocolate fudge cake recipe step showing a wire whisk mixing flour, sugar, and Dutch process cocoa powder in a large glass bowl.
  2. Add the eggs, buttermilk, vegetable oil, and vanilla extract directly to the dry ingredients bowl. Using a whisk or hand mixer on low speed, mix until just combined — about 30 seconds. The batter will be thick at this stage.
    Chocolate fudge cake recipe step showing a wire whisk mixing thick, dark chocolate batter in a large ceramic bowl.
  3. With the mixer on low speed, carefully pour the boiling coffee (or boiling water) into the batter in a slow, steady stream. Mix until fully combined. The batter will become very thin and pourable — almost like chocolate milk. This is completely correct. Do not add more flour.
    Chocolate fudge cake recipe step showing hot steaming coffee being poured from a glass measuring cup into thick chocolate batter.
Bake
  1. Divide the batter evenly between the two prepared cake pans. Tap each pan gently on the counter 2–3 times to release air bubbles.
    Chocolate fudge cake recipe step showing a baker holding a round metal baking pan filled with dark chocolate batter over a wooden counter.
  2. Bake for 30–35 minutes until a toothpick inserted in the center comes out with just a few moist crumbs — not wet batter. Begin checking at 28 minutes. Do not overbake.
    Chocolate fudge cake recipe step showing a wooden toothpick inserted into the center of a freshly baked dark chocolate cake.
  3. Let cakes cool in their pans for exactly 10 minutes. Then carefully run a knife around the edges and turn out onto a wire rack. Cool completely before frosting — at least 1 full hour.
    Chocolate fudge cake recipe step showing two round baked chocolate cakes cooling completely on a metal wire rack over a wooden table.
Make the Chocolate Fudge Frosting
  1. Melt the dark chocolate in a microwave-safe bowl in 20-second bursts, stirring between each, until fully smooth. Set aside to cool to room temperature.
    Chocolate fudge cake recipe step showing smooth melted dark chocolate in a rustic ceramic bowl on a wooden kitchen counter.
  2. In a large bowl, beat the softened butter with an electric mixer on medium-high speed for 3–4 minutes until pale and very fluffy. Scrape down the bowl halfway through.
    Chocolate fudge cake recipe step showing pale, fluffy beaten butter in a rustic ceramic bowl with electric mixer beaters.
  3. Add the sifted cocoa powder and beat for 1 minute on medium speed.
    Chocolate fudge cake recipe step showing hands sifting dark cocoa powder through a strainer into a bowl of fluffy whipped butter.
  4. Add powdered sugar and heavy cream in three alternating additions, beating well between each addition. Start and end with powdered sugar.
    Chocolate fudge cake recipe step showing heavy cream being poured from a glass jug into thick chocolate frosting in a ceramic bowl.
  5. Add vanilla extract and salt. Mix to combine.
    Chocolate fudge cake recipe step showing dark vanilla extract dripping into a bowl of rich chocolate frosting next to a pile of coarse salt.
  6. Pour in the cooled melted dark chocolate. Beat on high speed for 2 minutes until the frosting is glossy, thick, and smooth. If too thick, add cream 1 teaspoon at a time. If too thin, add powdered sugar 2 tablespoons at a time.
    Chocolate fudge cake recipe step showing cooled melted dark chocolate being poured into a glass bowl of frosting while mixing with an electric hand mixer.
Assemble and Frost
  1. Place one cooled cake layer on a cake board or serving plate. Spread a generous layer of frosting (about ¾ cup) evenly across the top using an offset spatula.
    Chocolate fudge cake recipe step showing an offset spatula spreading a thick layer of chocolate frosting over a single round cake layer.
  2. Place the second cake layer on top, pressing gently to level.
    Chocolate fudge cake recipe step showing a baker gently placing the second chocolate cake layer on top of a frosted base layer.
  3. Apply a thin "crumb coat" — a thin layer of frosting spread all over the top and sides of the cake to seal in any loose crumbs. Refrigerate for 15 minutes until the crumb coat is firm.
    Chocolate fudge cake recipe step showing a two-layer chocolate cake with a thin crumb coat of frosting on a wooden table to seal in crumbs.
  4. Apply the final layer of frosting generously over the top and sides. Smooth with an offset spatula for a clean finish, or create swoops and swirls for a rustic look.
    Chocolate fudge cake recipe step showing a hand using an offset spatula to create rustic swirls in thick chocolate frosting on a layer cake.
  5. Garnish with chocolate shavings, a dusting of cocoa powder, or fresh berries. Slice with a hot damp knife for clean cuts.
    Chocolate fudge cake recipe step showing a hand slicing a frosted layer cake topped with chocolate shavings using a large knife.
Serve
  1. Serve at room temperature for best flavor and texture. Pairs perfectly with a scoop of vanilla ice cream, fresh raspberries, or a cold glass of milk. Enjoy!
    Chocolate fudge cake recipe slice served on a speckled plate with a scoop of vanilla ice cream, fresh raspberries, and a glass of milk.

Notes

  • Dutch process cocoa is essential. Do not substitute natural (unsweetened) cocoa powder — it reacts differently with the leavening agents and will give you a noticeably less chocolatey, lighter cake. Dutch process cocoa gives the signature deep color and smooth, intense flavor.
  • The thin batter is correct. After adding boiling coffee, the batter will look like chocolate milk. This is the moisture secret — do not add more flour.
  • No buttermilk? Add 1 tablespoon of white vinegar or lemon juice to 1 cup of regular whole milk. Stir and let sit 5 minutes. Full-fat Greek yogurt thinned with a splash of milk also works perfectly.
  • Oil is non-negotiable for moisture. Do not substitute butter for the oil in the cake layers — butter solidifies when cold and creates a denser, drier texture. Oil stays liquid at room temperature, keeping the cake moist for days.
  • Boiling coffee vs boiling water. Coffee deepens and amplifies the chocolate flavor without any detectable coffee taste. Use it. If you prefer, boiling water works but the chocolate flavor will be slightly less intense.
  • Room temperature ingredients. Cold eggs and buttermilk do not emulsify properly and affect the final texture. Take everything out of the fridge 45–60 minutes before baking.
  • Crumb coat is not optional. Skipping the crumb coat causes the final frosting layer to drag crumbs across the surface. 15 minutes of patience gives you a professional-looking finish.
  • Brown sugar upgrade. Replace 1 cup of granulated sugar with 1 cup of brown sugar for extra moisture from the molasses. The cake will stay softer for 1–2 extra days.
  • Mayonnaise secret. Add 2–3 tablespoons of mayonnaise to the wet ingredients for extraordinary moisture. Mayonnaise is just emulsified oil and eggs — it adds richness without any detectable flavor.
  • Eggless version. Replace each egg with 3 tablespoons of aquafaba (chickpea liquid) or 1 tablespoon ground flaxseed + 3 tablespoons water (sit 5 min).
  • Gluten-free version. Substitute all-purpose flour 1:1 with a quality GF baking blend (King Arthur Measure for Measure or Bob's Red Mill 1:1).
  • UK/Australia note. "All-purpose flour" = plain flour. "Powdered sugar" = icing sugar. "Heavy cream" = double cream. "Granulated sugar" can be substituted with caster sugar.
  • Storage — Room temp: Airtight container up to 3 days. Fridge: Up to 7 days — bring to room temperature 45 minutes before serving. Freezer (unfrosted layers): Wrapped tightly, up to 3 months. Freezer (frosted whole cake): Up to 2 months.
  • Make-ahead party timeline: Bake layers 3 days ahead (freeze). Thaw 1 day before, frost and refrigerate. Remove from fridge 45 minutes before serving.