Prepare the pan: Preheat oven, line pan with parchment, and grease.
Make the sponge: Mix batter until smooth, pour into pan, and spread evenly.
Bake: Bake 12–15 minutes until springy; avoid overbaking.
Roll while warm: Invert onto sugared towel, peel parchment, roll up, and cool.
Make filling: Beat cream cheese and butter, add sugar, vanilla, and crushed Oreos, then chill.
Assemble: Unroll cake, spread filling, and reroll seam side down.
Decorate & serve: Drizzle white chocolate, add Oreos, slice, and enjoy.