Step 1: Prepare the Cake Batter
Preheat the Oven: Set your oven to 350°F (175°C) and line a 10x15-inch jelly roll pan with parchment paper. Lightly grease the paper to prevent sticking.
Whip the Eggs and Sugar: In a large bowl, beat the eggs and granulated sugar with an electric mixer until thick, pale, and fluffy (about 5-7 minutes). This is key for a light sponge!
Add Dry Ingredients: Sift together the flour, cocoa powder, baking powder, and salt. Gently fold the dry ingredients into the egg mixture in three additions to maintain the airiness.
Incorporate Vanilla: Add the vanilla extract and fold gently until fully combined.
Step 2: Bake the Cake
Spread the Batter: Pour the batter evenly into the prepared pan, smoothing the top with a spatula.
Bake: Bake for 10-12 minutes, or until the cake springs back when lightly touched. Avoid overbaking, as this can cause cracking when rolling.
Step 3: Roll the Cake
Prepare a Rolling Surface: Dust a clean kitchen towel with powdered sugar to prevent sticking.
Flip the Cake: Carefully turn the warm cake out onto the prepared towel. Peel off the parchment paper.
Roll While Warm: Starting at a short end, roll the cake and towel together into a spiral. Let it cool completely in this rolled shape—it helps the cake “remember” its form!
Step 4: Make the Filling
Whip the Cream: In a chilled bowl, beat the heavy cream, powdered sugar, and vanilla extract until soft peaks form. Be careful not to overwhip!
Step 5: Assemble the Cake
Unroll the Cake: Gently unroll the cooled sponge, being careful not to force it flat.
Spread the Filling: Evenly spread the whipped cream over the cake, leaving a small border around the edges.
Re-Roll the Cake: Roll the cake back up (without the towel this time) and place it seam-side down on a serving platter.
Step 6: Decorate
Dust the top with powdered sugar for a snowy effect.
Add sprinkles or edible decorations for a festive flair.