Ingredients

The following ingredients create a two-layer tiramisu cake with a soft coffee-infused sponge and a rich mascarpone filling.

For the keto sponge cake

• 2 cups (200 g) finely ground blanched almond flour
• 4 large eggs, separated
• ½ cup (100 g) granulated erythritol or a suitable monk fruit sweetener blend
• ¼ cup (60 g) unsalted butter, melted and cooled
• 1 teaspoon baking powder
• 1 teaspoon vanilla extract
• ¼ teaspoon salt

For the coffee soaking mixture

• ½ cup (120 ml) strong brewed espresso or strong coffee, cooled
• 1 teaspoon instant espresso powder, optional for a stronger flavor
• 1–2 teaspoons keto-friendly powdered sweetener, optional

For the mascarpone cream filling

• 8 oz (225 g) mascarpone cheese, chilled
• 1 cup (240 ml) heavy whipping cream, cold
• ⅓ cup (65–70 g) powdered erythritol or monk fruit sweetener
• 1 teaspoon vanilla extract
• ½ teaspoon finely grated lemon zest, optional

For decoration

• 1–2 tablespoons unsweetened cocoa powder
• A few dark chocolate shavings made from low-carb chocolate, optional

Step-by-Step Instructions

Step 1: Prepare the oven and cake pans

Preheat your oven to 175°C (350°F). Grease two 8-inch round cake pans with butter and line their bases with parchment paper. Preparing the pans first makes it easier to remove the delicate almond flour cakes after baking.

Step 2: Mix the dry and wet ingredients

In a medium bowl, whisk together the almond flour, baking powder, and salt. In another bowl, beat the egg yolks with the granulated sweetener until the mixture looks lighter and creamy. Add the melted butter and vanilla extract, then mix until combined.

Gradually fold the dry ingredients into the yolk mixture. The batter will be thicker than traditional wheat-flour cake batter, which is normal for an almond flour sponge.

Step 3: Whip the egg whites

In a clean, grease-free bowl, beat the egg whites until stiff peaks form. This step helps give the keto cake a lighter texture without relying on wheat flour.

Gently fold one-third of the whipped egg whites into the almond flour batter to loosen it. Fold in the remaining whites in two additions, using a spatula and avoiding vigorous stirring so you preserve as much air as possible.

Step 4: Bake the sponge layers

Divide the batter evenly between the prepared pans and smooth the tops. Bake for approximately 20–25 minutes, or until the centers are set and a toothpick inserted into the middle comes out clean.

Let the cakes cool in their pans for 10 minutes before carefully transferring them to a wire rack. Allow them to cool completely before adding coffee or cream. Warm cake can melt the filling and make the finished dessert unstable.

Step 5: Prepare the espresso mixture

Combine the cooled espresso with the optional instant espresso powder and powdered sweetener. Stir until dissolved.

Brush the coffee mixture lightly over the surface of both cooled cake layers. Start with a small amount and add more as needed. Almond flour cake is more delicate than traditional ladyfingers, so avoid soaking it until soggy.

Step 6: Make the mascarpone cream

Place the chilled mascarpone, powdered sweetener, and vanilla in a large bowl. Mix briefly on low speed until smooth. In a separate bowl, whip the cold heavy cream until it reaches medium-stiff peaks.

Gently fold the whipped cream into the mascarpone mixture in two or three additions. Stop as soon as the filling is thick, smooth, and spreadable. Avoid overmixing, as mascarpone can become grainy or separate if beaten too aggressively.

Step 7: Assemble the tiramisu cake

Place the first sponge layer on a serving plate or cake stand. Spread approximately half of the mascarpone cream evenly over the top.

Position the second sponge layer on top and cover the surface and sides with the remaining cream. For a rustic appearance, smooth the frosting with a spatula. For a more elegant presentation, pipe a few swirls of cream around the top edge.

Step 8: Chill and decorate

Refrigerate the assembled cake for at least 4–6 hours, preferably overnight. Chilling allows the coffee flavor to develop and helps the cream firm up for cleaner slices.

Just before serving, dust the top with unsweetened cocoa powder through a fine sieve. Add a few dark chocolate shavings if desired, then slice with a sharp knife wiped clean between cuts.

Tips for the Perfect Keto Tiramisu Cake

• Use finely ground almond flour. Coarse almond meal can make the sponge heavy and crumbly. Blanched almond flour gives a finer texture and a more attractive appearance.
• Choose powdered sweetener for the cream. Granulated sweetener may leave a slightly gritty texture in the mascarpone filling. A finely powdered, keto-friendly sweetener usually produces a smoother result.
• Keep the coffee strong. Espresso provides the recognizable tiramisu flavor without adding much carbohydrate. Allow it to cool before brushing it onto the sponge.
• Do not rush the chilling process. The filling needs time to firm up. For the cleanest slices, chill overnight and use a warm, dry knife.
• Adjust sweetness to taste. Mascarpone is naturally rich, so the filling does not need to be excessively sweet. If your sweetener contains stevia or monk fruit, follow its sweetness-equivalence instructions.

Storage Instructions

Store the finished cake in an airtight container in the refrigerator for up to 3 days for the best texture and freshness. Because the filling contains dairy, keep the cake refrigerated rather than leaving it at room temperature for extended periods.

You can also freeze individual slices in airtight containers for approximately 1 month. Thaw them overnight in the refrigerator before serving. The cream may soften slightly after freezing, but the flavor should remain delicious.

Estimated Nutritional Information

The values below are estimates for one slice when the cake is cut into 12 portions. Exact nutrition depends on the brands of almond flour, mascarpone, cream, and sweetener used.

Nutrient	Approximate amount
Calories	330–380 kcal
Fat	31–35 g
Protein	7–9 g
Total carbohydrates	7–10 g
Fiber	2–3 g
Net carbohydrates	5–7 g

Net carbohydrates are estimated by subtracting fiber and, where appropriate, qualifying sugar alcohols from total carbohydrates. Different sweeteners and product labels can change the result, so calculate from your actual ingredients if you track carbs closely.

Serving Suggestions

Serve each slice chilled alongside a freshly brewed espresso or unsweetened coffee. For a special occasion, add a few fresh raspberries on the plate or decorate the cake with a light cocoa dusting and low-carb chocolate curls. If you prefer a stronger coffee taste, add a little extra espresso to the soaking mixture without oversaturating the sponge.

This cake also works beautifully as a make-ahead dessert for celebrations because it can be assembled the day before serving.

Final Thoughts

This Keto Tiramisu Cake brings together everything people love about traditional tiramisu: coffee-soaked layers, silky mascarpone cream, and the bittersweet finish of cocoa powder. Almond flour creates a tender, low-carb sponge, while a keto-friendly sweetener replaces conventional sugar without sacrificing the dessert’s indulgent character.

With a little preparation and enough chilling time, you can create a beautiful homemade dessert that looks impressive, slices neatly, and delivers rich coffee flavor in every bite. Whether you follow a ketogenic diet or simply want to experiment with low-carb baking, this recipe is a wonderful way to enjoy a classic Italian-inspired treat with a keto-friendly twist.