Preheat oven to 350°F (175°C) and line a baking tray with parchment paper.
Beat eggs and sugar until light and fluffy. Add vanilla extract.
Sift in flour and baking powder, then gently fold into mixture.
Add milk and melted butter, mixing until smooth.
Spread batter evenly into tray and bake for 10–12 minutes until lightly golden.
Let sponge cool slightly, then remove from pan.
Whip heavy cream with powdered sugar and vanilla until stiff peaks form.
Spread whipped cream evenly over cooled sponge cake.
Add diced strawberries over cream layer.
Carefully roll cake tightly using parchment paper.
Chill roll for 45 minutes to set.
Slice into even pieces and serve.