Ingredients
For the Biscuits






For the White Chocolate Mousse






For the Dark Chocolate Mousse






Instructions
Step 1
Start by preheating your oven to 180 degrees Celsius (350 degrees Fahrenheit). Grease and flour two round cake pans.
In a bowl, whisk together the flour, sugar, cocoa powder, and a pinch of salt. In a separate bowl, combine the eggs, melted butter, and milk, stirring until well mixed. Gradually add the wet ingredients to the dry ingredients and mix until just combined.
Pour the batter evenly into the prepared cake pans. Bake for 25 to 30 minutes or until a toothpick inserted in the center comes out clean. Let them cool completely.
Step 2
While the biscuits are cooling, you can prepare the white chocolate mousse. Melt the white chocolate carefully in a microwave or double boiler until smooth. Allow it to cool slightly.
In a large mixing bowl, whip the heavy cream until soft peaks form. In another bowl, beat the egg whites and gradually add the sugar until stiff peaks form. Combine the melted white chocolate with the whipped cream, and gently fold in the egg whites until well mixed.
Step 3
In another bowl, melt the dark chocolate similarly to the white chocolate. Let it cool slightly. Then, whisk the egg yolks with the sugar until the mixture lightens in color.
Fold the melted dark chocolate into the yolk mixture, followed by the Baileys Irish Cream. Finally, whip another portion of cream and fold it in gently to keep the mixture airy.
Step 4
Once the biscuits are cool, place one layer on a serving platter. Spread half of the white chocolate mousse over the first layer. Top with the second biscuit layer and spread the dark chocolate mousse on top.
Finish by adding the remaining white chocolate mousse. Chill the cake in the refrigerator for at least 4 hours or overnight for best results before serving.
Servings
Equipment
Having a variety of sizes will help you mix your ingredients efficiently. Opt for glass or stainless steel for a more durable choice.
This allows the cake to be easily removed after baking. Make sure it's properly greased to avoid sticking.



An electric mixer can save you time and effort when whipping up the cake batter and mousse. Choose one with multiple speed settings.



A must-have for folding ingredients without deflating your mixtures. Look for a sturdy design that can handle thick batters.
Perfect for spreading frosting or mousse evenly on the surface of your cake. The bend in the blade gives you great control.



Variations
Faq
- What can I use if I don't have a springform pan?
If you don't have a springform pan, you can use a regular round cake pan, but you'll need to be careful when removing the cake. Allow it to cool completely before attempting to take it out using a knife to loosen the edges.
- How can I tell if my cake is done?
To check if your cake is done, insert a toothpick into the center. If it comes out clean or with a few moist crumbs, it’s ready. Be mindful not to over-bake!
- Can I add a different flavor to the mousse?
Absolutely! Feel free to experiment with different flavors like raspberry or coffee. Just substitute a portion of the chocolate with your chosen flavoring.
- How can I make my cake more moist?
To enhance the moisture of your cake, you can add a few tablespoons of sour cream or yogurt into the batter. Also, be careful not to over-bake it, as this can dry it out.
- What is the best way to store leftover cake?
The best way to store leftover cake is to keep it in an airtight container in the refrigerator. It will stay fresh for several days. You can also freeze it by wrapping slices tightly in plastic wrap.
- How can I prevent my cake from sinking in the middle?
Ensure your oven is preheated and avoid opening the oven door too often while baking. Mixing ingredients just until combined, rather than over-mixing, can also help prevent sinking.