Preheat the oven to 180°C (356°F).
Add eggs and sugar to a bowl and whip thoroughly.
Sift in all-purpose flour and baking powder, then mix gently.
Add milk and melted butter, stirring until smooth.
Line a pan with parchment paper and pour in the batter.
Bake in the oven for 25-30 minutes, then let cool completely.