Decadent Biscoff Fudge Cake Recipe

This Biscoff Fudge Cake combines ground Biscoff cookies folded into the batter with a rich, fudgy brownie-style buttercream for an indulgent, crowd-pleasing dessert. The warm, caramel-spiced cookie flavor pairs beautifully with deep chocolate, creating a layered cake that’s moist, tender, and full of character.

If you love Biscoff and chocolate together, this cake delivers. Each bite offers a balance of cookie-crisp warmth and chocolate richness that will have guests asking for seconds. It works well for family dinners, celebrations, or when you simply want a special homemade treat.

Other Biscoff-inspired recipes to try: Banana Biscoff Cake, Ultimate Biscoff Cake, Biscoff Banana Bread.

Why this recipe is so amazing

• Biscoff-infused cake layers – Ground Biscoff cookies are blended into the dry ingredients for a distinct cookie flavor throughout the cake.
• Fudgy brownie buttercream – The frosting uses a chocolate ganache base whipped into butter for an intense, brownie-like chocolate taste and a creamy texture.
• Three-layer presentation – This recipe makes a three-layer 8-inch cake; you can also use four 6-inch pans if you prefer more layers.
• Versatile celebration cake – Elegant enough for celebrations but simple enough for a delicious family dessert.

Step-by-step: cake layers

STEP 1: Prepare pans and preheat. Preheat the oven to 325°F (163°C). Spray three 8-inch cake pans, line the bottoms with parchment, and spray the parchment. Set pans aside.

STEP 2: Grind the Biscoff cookies. Pulse the cookies in a food processor or blender until they become a fine crumb. Combine the Biscoff crumbs with the flour, baking powder, baking soda, and salt in a bowl and whisk to combine.

STEP 3: Cream the butter, sugar, and oil. In a stand mixer fitted with the paddle attachment, beat the unsalted butter, packed light brown sugar, and vegetable oil on medium speed until light, fluffy, and paler in color, about 5 minutes. Stop once to scrape down the bowl.

STEP 4: Add the eggs and vanilla. Add the eggs one at a time, beating about 30 seconds after each addition. Scrape the bowl as needed. Add the vanilla and mix on low just until combined.

STEP 5: Alternate dry ingredients with buttermilk. With the mixer on the lowest speed, add one-third of the dry mixture, then half the buttermilk. Repeat, ending with the dry ingredients. Mix only until incorporated. Scrape the bowl and fold gently by hand to ensure an even batter.

STEP 6: Bake. Divide batter evenly among prepared pans (about 20 ounces / 560 g per pan). Bake 30–35 minutes, or until a toothpick inserted in the center comes out with little to no crumbs. Because of the cookie crumbs and brown sugar, the tops may brown slightly—that’s normal.

Cool the pans on a wire rack for about 15 minutes, then remove the cakes to finish cooling. Bring the layers to room temperature before wrapping and storing or assembling.

Fudgy brownie-style buttercream

Step 1: Heat the chocolate. Place the chopped dark chocolate in a microwave-safe bowl. Heat in 30-second increments, stirring between sessions, until mostly melted but still slightly chunky.

Step 2: Heat the cream and make ganache. Warm the heavy cream until very hot but not boiling. Pour the hot cream over the warm chocolate and let sit for 2 minutes. Stir until smooth and glossy. Allow the ganache to cool to room temperature before using.

Step 3: Whip the butter. In a mixer fitted with the paddle attachment, beat the slightly chilled unsalted butter on medium-high for about 2 minutes until smooth and lighter in color.

Step 4: Combine ganache with butter. Add the cooled chocolate-cream mixture to the butter, scrape the bowl, and beat for another minute to combine.

Step 5: Add powdered sugar and finish. Add sifted powdered sugar, sifted unsweetened cocoa, vanilla, and salt. Mix on low until combined, then increase speed and beat for 2–3 minutes until light and fluffy. If air pockets are visible, fold the buttercream gently by hand with a spatula.

Tip: If you plan to do extra piping or decorative borders, make an additional half batch of buttercream.

Tips for assembly

• Level the cake layers if necessary for an even stack.
• Chill or freeze the layers slightly; slightly firm layers are easier to frost cleanly.
• Place the first layer on a cake board, top side up, and spread about 1 cup of buttercream evenly.
• Repeat with the second layer, then place the final layer top side down for a flat top.
• Apply a thin crumb coat of buttercream and freeze for 10–15 minutes to set the crumb coat.
• Finish with the remaining buttercream and decorate as desired. Allow the cake to come to room temperature before serving.

Expert baking tips

• Bring the eggs, butter, and buttermilk to room temperature before mixing; this helps the batter emulsify and rise properly.
• You can bake the layers ahead and assemble on the day you plan to serve the cake.
• Sift the powdered sugar and cocoa before adding them to the buttercream for a smooth, silky texture without lumps.
• Invest in heavy, reliable cake pans for even baking and consistent results.

Storing and freezing

If you need to split the work across multiple days, bake the layers, cool them completely, wrap each tightly in plastic wrap, and refrigerate or freeze. Chilled layers are easier to level and decorate because they produce fewer crumbs and are less likely to slide. Refrigerated cake layers will keep 3–5 days.

Freezing the finished cake

To freeze the fully decorated cake, chill it first so the frosting firms up. Wrap the cake tightly in plastic wrap, and for longer storage add a layer of aluminum foil. Properly wrapped, the cake can be frozen for up to six months. Thaw the cake overnight in the refrigerator; once thawed, move to room temperature before serving to reduce condensation on the frosting.

Recipe

Ingredients

For the Biscoff cake layers

• 22 Biscoff cookies, pulverized to a fine crumb
• 2 1/4 cups all-purpose flour
• 2 teaspoons baking powder
• 1 teaspoon baking soda
• 1 teaspoon salt
• 1 cup unsalted butter, room temperature
• 1 2/3 cups packed light brown sugar
• 1/4 cup vegetable oil
• 4 large or extra-large eggs, room temperature
• 1 teaspoon vanilla extract
• 2 cups buttermilk, room temperature

For the fudgy buttercream

• 2 cups unsalted butter, slightly chilled
• 3/4 cup unsweetened baking cocoa, sifted
• 1 teaspoon salt
• 4 1/2 cups powdered sugar, sifted
• 3/4 cup heavy cream
• 2 cups dark chocolate (chopped or chips) for ganache
• 1 teaspoon vanilla extract

Instructions

For the cake layers

1. Preheat the oven to 325°F (163°C). Prepare three 8-inch pans with cooking spray and parchment, and set aside.
2. Process the Biscoff cookies into a fine crumb. In a medium bowl, whisk the Biscoff crumbs with flour, baking powder, baking soda, and salt.
3. In a stand mixer with the paddle attachment, cream the butter, brown sugar, and oil on medium speed until light and fluffy, about 5 minutes.
4. Add the eggs one at a time, beating about 30 seconds after each addition. Add vanilla and mix on low just to combine.
5. With the mixer on low, add one-third of the dry ingredients, then half the buttermilk. Repeat, ending with the dry ingredients. Mix only until just combined. Scrape the bowl and fold gently to ensure an even batter.
6. Divide the batter evenly among the prepared pans (about 20 ounces per pan). Bake 30–35 minutes or until a toothpick comes out clean or with minimal crumbs. Allow to cool 15 minutes in the pans, then transfer to a wire rack to cool completely.

For the fudgy buttercream

1. Place the chopped dark chocolate in a heatproof bowl. Warm in the microwave in 30-second bursts, stirring in between, until mostly melted.
2. Heat the heavy cream until nearly boiling, then pour it over the warm chocolate. Wait 2 minutes, then stir to create a smooth ganache. Let cool to room temperature.
3. Beat the chilled butter in a mixer for about 2 minutes until smooth and lighter in color.
4. Add the cooled ganache to the butter and beat for another minute. Scrape the bowl as needed.
5. Add sifted powdered sugar, sifted cocoa, vanilla, and salt. Mix on low until combined, then increase speed and beat 2–3 minutes until light and fluffy. Fold by hand to remove any air pockets.

Assembly

1. Level the cake layers if needed. Chilled layers are easier to work with.
2. Place the first layer on a cake board, top side up, and spread about 1 cup of buttercream evenly across the layer.
3. Repeat with the second layer. Place the final layer top side down for a flat finish.
4. Apply a thin crumb coat of buttercream to seal crumbs, then chill or freeze for 10–15 minutes.
5. Finish frosting with the remaining buttercream and decorate as desired. Serve at room temperature.