01 -
Preheat oven to 190°C. Line a 10×15-inch jelly roll pan with parchment paper. Whisk together flour, cocoa powder, baking powder, and salt. Beat eggs and sugar on high speed for 3-4 minutes until pale and fluffy, then gently mix in vanilla extract and milk. Sift the dry ingredients into the egg mixture and fold until just combined. Spread batter evenly in the prepared pan and bake for 10-12 minutes, or until the cake springs back when touched.
02 -
Lay a clean kitchen towel on the counter and dust it with powdered sugar. Immediately invert the warm cake onto the towel, remove the parchment paper, and roll it up from the short end with the towel inside. Let cool completely.
03 -
Beat heavy cream, powdered sugar, and vanilla until stiff peaks form.
04 -
Gently unroll the cooled cake and spread the whipped cream evenly over the surface. Roll the cake back up without the towel. Place it seam-side down on a serving platter and chill while making the ganache.
05 -
In a saucepan, heat heavy cream until steaming (not boiling). Pour the hot cream over the chocolate chips and butter, let sit for 1-2 minutes, then stir until smooth. Let the ganache cool slightly before spreading it over the rolled cake. Use a fork to create a log-like texture.
06 -
Dust the cake with powdered sugar for a snowy effect. Add chocolate shavings, fresh berries, or meringue mushrooms as festive decorations. Chill for 1 hour before slicing and serving.