This is what you'll need.
Mix together the flour, sugar, salt, vanilla extract, eggs, baking powder and milk.
You'll have a liquid mixture.
Line a large tin with parchment paper and butter. We need to make sure it doesn't stick while baking.
Take a spoonful of the mixture, put it into a pastry bag and draw out a giraffe pattern.
Now add the cocoa powder to the remaining mixture. Mix well.
Gently pour you cocoa mixture over the pattern.
Spread it around with a spatula. Be careful not to ruin the pattern.
Preheat a oven at 200ºC. Then put the tin in the oven and bake for about 10 minutes. Check with a toothpick. If it comes out clean, it's done.
Take it out, let it cool for a minute, then gently overturn it to check how the pattern came out.
Turn it around again and start spreading your Nutella.
Trim the edges.
Admittedly, I cook it a little too longer, and it refused to roll up properly. Anyway the taste was fantastic :)
Serve with ice cream and enjoy :)