Sponge Cake:
Preheat the oven to 350°F (175°C).
Line a baking sheet with parchment paper.
In a mixing bowl, beat eggs, sugar, and vanilla until light and fluffy.
Sift in flour, baking powder, cocoa powder, and salt. Gently fold until just combined.
Pour the batter onto the prepared baking sheet and spread evenly.
Bake for 10-12 minutes or until the cake springs back when touched.
Rolling the Cake:
While the cake is still warm, invert it onto a kitchen towel dusted with confectioners' sugar.
Roll the cake from the short end along with the towel.
Allow it to cool completely.
Whipped Cream Filling:
Whip the cream until soft peaks form.
Fold in powdered sugar and vanilla extract.
Assembly:
Carefully unroll the cooled cake.
Spread the whipped cream evenly over the cake.
Roll the cake back up without the towel.
Chocolate Ganache:
Heat the heavy cream until just simmering.
Pour over the chopped chocolate and let it sit for a minute.
Stir in the butter until smooth.
Final Touch:
Coat the Yule Log with chocolate ganache.
Use a fork or spatula to create a bark-like texture.
Refrigerate for at least 2 hours before serving.