Preheat your oven to 325°F (160°C) and line a jelly roll pan with parchment paper.
In a large bowl, whip together eggs and sugar until pale and fluffy (about 5 minutes).
Sift together flour, cocoa powder, baking powder, and salt in another bowl.
Gently fold the dry ingredients into the egg-sugar mixture.
In a separate bowl, whisk together melted butter, sour cream, milk, and vanilla extract. Fold into the batter until combined.
Pour the batter into the prepared pan and spread evenly. Bake for 22-28 minutes or until the cake springs back when lightly pressed.
Let the cake cool in the pan for 5 minutes, then dust with powdered sugar and roll it up in a clean kitchen towel. Allow it to cool in this shape for 2 hours.
For the filling, beat cream cheese and powdered sugar until smooth. Gradually add heavy whipping cream until stiff peaks form.
Unroll the cake and spread the cream filling evenly over the surface, leaving a small border. Roll the cake back up tightly and chill for 1-2 hours.
For the glaze, heat heavy cream in a saucepan, add chopped chocolate and corn syrup, stirring until smooth.
Once chilled, place the cake on a wire rack and pour the glaze over, allowing it to drip down the sides. Let set for about 1 hour before slicing.
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Notes
Store leftovers in the refrigerator for up to a week.