Chocolate Peanut Butter Cake with Condensed Milk Soak
A decadent two-layer chocolate cake infused with hot coffee for depth, spiked with creamy peanut butter throughout. The signature technique involves piercing warm cake and soaking it with sweetened condensed milk mixed with peanut butter, allowing the liquid to absorb into the crumb for moisture and richness. Topped with peanut butter whipped cream and finished with fudge sauce and peanut butter cups, this dessert delivers intense cocoa and peanut butter flavors in every bite. The tender crumb contrasts beautifully with the thick, creamy topping. Perfect for chocolate-peanut lovers seeking something beyond standard layer cakes. Serve at gatherings, celebrations, or when you want an indulgent, showstopping dessert that feels special yet approachable.
Ingredients
- 2 kop flour
- 2 kop sugar
- ¾ kop cocoa powder, sifted
- 1 el salt
- 1 el baking powder
- ½ kop vegetable oil
- 1 kop buttermilkmilk mixed with 1 tablespoon vinegar or lemon juice1:1dairy
combine and let sit 5 minutes
Full guide → - 2 eggsflax eggs or aquafaba replacement2 eggs=3 tablespoons ground flax mixed with 6 tablespoons water or 1/4 cup aquafabavegan
reduces binding slightly, may need 1-2 extra minutes baking
Full guide → - 1 tl vanilla
- 1 kop hot coffee
- 1 ¾ cups sweetened condensed milk
- ¾ kop creamy peanut butteralmond butter or sunflower seed butter1:1allergenpeanuts-freeadds dairy
similar texture and richness
Full guide → - 1 cups whipping cream
- peanut butter cups(optional)almond butter or sunflower seed butter1:1allergenpeanuts-freeadds dairy
similar texture and richness
Full guide → - peanut butter(optional)almond butter or sunflower seed butter1:1allergenpeanuts-freeadds dairy
similar texture and richness
Full guide → - fudge sauce(optional)
Instructions
- 1
Preheat oven to 350°F.
- 2
Grease two 7 ⅛" round cake pans or three 6" pans and line bottoms with baking paper.
- 3
Combine flour, sugar, sifted cocoa powder, salt, baking powder, and baking soda in a mixing bowl with an electric mixer fitted with a paddle attachment.
- 4
In a separate medium bowl, whisk together oil, buttermilk, eggs, and vanilla.
- 5
Slowly add coffee to the wet mixture to avoid cooking the eggs.
- 6
Pour wet ingredients into dry ingredients and stir slowly until combined, then mix on high speed for two minutes, scraping sides halfway through.
- 7
Divide batter evenly between prepared pans.
- 8
Bake until a toothpick inserted in the center comes out clean or with a few moist crumbs, about 35-45 minutes.
- 9
Cool for a few minutes, then run a knife around edges and transfer cakes to a cooling rack.
- 10
While cakes are still warm, poke holes throughout using the end of a wooden spoon.
- 11
Mix sweetened condensed milk with peanut butter in a bowl and slowly pour over the warm cake, allowing the mixture to seep into the holes.
- 12
Allow to cool completely.
- 13
Whip cream until soft peaks form.
- 14
Fold remaining peanut butter into whipped cream and spread over cooled cake.
- 15
Top with additional peanut butter, fudge sauce, and peanut butter cups.
- 16
Refrigerate until ready to serve.
Tips
Poke holes while cake is warm so the condensed milk-peanut butter mixture absorbs deeply into the crumb. This creates moist layers and prevents a dry cake. Patience with the slow pouring ensures even distribution throughout.
Use creamy peanut butter rather than natural oil-separated versions for a smoother filling. Whipping cream to soft peaks, not stiff peaks, makes folding easier and produces a lighter, more cohesive topping.
If using three 15cm pans instead of two 18cm, reduce baking time by 5-10 minutes and check for doneness earlier. Thinner layers bake faster and risk overcooking edges.
Good to Know
Cover and refrigerate up to 3 days. Flavors develop slightly as condensed milk continues absorbing.
Bake cake layers 1 day ahead; cool completely before wrapping. Assemble with soak and frosting same day or day before for best texture.
Serve chilled directly from refrigerator. Bring to room temperature for 15-20 minutes if preferred for softer texture.
Common Mistakes
Do not add coffee too quickly to eggs or they will scramble and create lumps.
Do not skip poking holes or the soak will sit on the surface instead of penetrating the crumb.
Do not overbake; stop when toothpick shows moist crumbs to preserve the cake's structure for soaking.
Substitutions
Dairy-Free Swaps
combine and let sit 5 minutes
Full guide →Vegan Options
reduces binding slightly, may need 1-2 extra minutes baking
Full guide →Nut-Free Alternatives
similar texture and richness
Full guide →General Alternatives
FAQ
Can I make this cake without the condensed milk soak?
Yes, though the signature moisture and richness will be reduced. Instead, you could brush warm cake with simple syrup or a peanut butter glaze. The cake works as a standard layer cake, but loses the unique wet texture that defines this version.
What if I don't have buttermilk?
Mix regular milk with 1 tablespoon vinegar or lemon juice and let sit 5 minutes before using. This creates the acidity needed for proper leavening and tender crumb. The substitution works 1:1 and is reliable.
How long does this cake keep refrigerated?
Properly covered, it lasts up to 3 days in the refrigerator. The condensed milk soak keeps the cake moist throughout storage. Flavors actually improve slightly as the soak continues absorbing. Beyond 3 days, texture deteriorates and cream topping may separate.