If you are looking for an ultra-rich, intensely sweet chocolate dessert, Chocolate Sin Cake is pure indulgence. This decadent layered cake features a moist cocoa sponge base topped with silky white chocolate cream and luscious dark chocolate cream. It is the perfect show-stopping dessert for birthdays, holidays, and special occasions.

Ingredients for the Sponge

• 3 containers (6 oz each) plain yogurt
• 3 cups all-purpose flour
• 1 1/2 cups granulated sugar
• 1/2 cup + 2 tablespoons vegetable oil
• 3 tablespoons unsweetened cocoa powder
• 1 tablespoon baking powder
• 10 tablespoons milk
• 1 teaspoon pure vanilla extract
• 1/4 teaspoon salt

Ingredients for the Dark Chocolate Cream

• 4 large egg yolks
• 1/2 cup granulated sugar
• 3/4 cup milk
• 7 ounces dark chocolate (60% cocoa recommended)
• 2 cups heavy whipping cream
• 2 packets unflavored gelatin (about 0.5 ounces total)
• 2 teaspoons vanilla sugar or 1 teaspoon vanilla extract
• 3 tablespoons rum
• 2 tablespoons powdered sugar

Ingredients for the White Chocolate Cream

Use the same ingredients as the dark chocolate cream, but replace the dark chocolate with:

• 7 ounces white chocolate

Instructions

Sponge

1. Preheat the oven to 400°F.
2. Line an 11-inch round cake pan with parchment paper.
3. In a large bowl, sift together flour, cocoa powder, baking powder, and salt.
4. Add yogurt, sugar, milk, and vanilla extract. Mix until combined.
5. Slowly pour in the oil while mixing until the batter becomes smooth.
6. Pour the batter into the prepared pan.
7. Bake for about 20 minutes, or until a toothpick inserted into the center comes out clean.
8. Allow the sponge to cool completely.

Dark and White Chocolate Cream

1. Gently heat the milk with vanilla and rum. Do not allow it to boil.
2. In a separate bowl, beat the egg yolks with sugar until pale and creamy.
3. Slowly whisk the egg mixture into the warm milk.
4. Cook over low heat for 8 to 10 minutes, stirring constantly, until slightly thickened. The mixture will remain pourable.
5. Let the custard cool completely.
6. Melt the chocolate and allow it to cool slightly.
7. Whip the heavy cream with powdered sugar until stiff peaks form.
8. Fold the cooled custard into the whipped cream.
9. Add the melted chocolate and mix gently until smooth.
10. Prepare the gelatin according to package directions and mix it into the cream until fully incorporated.

Repeat the same process for the white chocolate cream.

Assembling the Cake

1. Place the cooled sponge back into the cake pan or cake ring.
2. Spread the white chocolate cream evenly over the sponge.
3. Carefully spread the dark chocolate cream over the white layer.
4. Refrigerate for at least 4 hours, preferably overnight, until fully set.

Decoration

To make chocolate shavings, spread melted chocolate thinly on a flat surface. Refrigerate until firm, then scrape with a spatula or knife to create curls. Decorate the top of the cake with the chocolate shavings.

Helpful Tips

• Avoid touching chocolate shavings with your fingers, as body heat will melt them.
• For softer, creamier layers use instant gelatin.
• For firmer, mousse-like layers use sheet gelatin or bloomed powdered gelatin.