1. Remove the cream layer inside the oreo cookies, and crush oreos in a blender or food processor until you have fine crumbs. Set aside.
2. In a bowl whisk together eggs, sugar and salt using a egg wishk. Pour the milk into the egg mixture slowly, gradually and mix well.
3. Add the sifted flour and black cocoa powder and mix well until the batter is integrated.
4. Strain the crepe mixture through a fine sieve. Add the melted butter and mix well. Cover with plastic wrap and let it sit at room temperature for about 30min to 1h or even overnight.
Cooking the crepes :
5. Heat about 20 cm non-stick pan on medium heat. Once the pan is hot, brush with oil and remove the excess with a paper towel (a thin application, only the first time is fine). Pour enough batter to cover the bottom of the pan and swirl it to coat evenly. Once the batter is dry and the edges start to dry, flip the crepe with your hand. Let it cook on the other side for a few seconds. Then transfer to a plate to cool down. Repeat the same until the batter finished.
6. Once cooled completely, use a 18 cm round plate or cake bottom as a guide and cut off crepe in excess.
Putting it all together :
7. Whip chilled Whipping Cream (400ml) for a few second, add granulated sugar (60g), and beat until stiff peaks form.
NOTE : if your cream is less than 35% fat, then I recommend you to add whipped cream stabilizer (I used "cremfix" here). In that case, mix cream stabilizer to the sugar ahead of this step. Add when your cream is reaching soft peak.
8. Now spread a good amount of cream evenly over one crepe. Cover with another crepe and repeat until all have been used. Finally cover the cake with cream (sides too).
9. Sprinkle oreo powder over the top and sides. Let chill in the fridge for a few hours until it has set.