Matcha Roll Cake

Preheat oven to 180°C (350°F). Line a 30x30 cm (12x12 inch) baking sheet with parchment paper.

Melt the unsalted butter in a small saucepan over low heat, then add the milk and warm slightly until just lukewarm. Set aside.

Sift the cake flour and matcha powder together into a bowl. Set aside.