Start by brewing the espresso so it has time to cool as you prepare the cream. Place it in a shallow dish that's at least the size of an Oreo (not too big either - but your hand has to fit in it with the Oreo lol). Place it in the fridge to cool if you have to.
120 mL (1/2 cup) espresso
Make sure to use a very clean bowl, I like to wipe down my bowl and whisk attachment a little vinegar. Place the egg whites in the clean bowl and turn the mixer up to medium speed. Stream in half of the sugar over 1 minute with the mixer going and then increase the speed to high, just until stiff peaks start to form. *see notes if you want to cook the eggs first*
3 large eggs, 100 grams (1/2 cup) granulated sugar
In another bowl (or if using the stand mixer and you don't have a second bowl, move the egg whites to another bowl) place the egg yolks, mascarpone, vanilla and the other half of the sugar and beat at full speed, for a few minutes, until the mixture is pale and fluffy. Make sure to scrape the edge of the bowl at least once throughout.
3 large eggs, 100 grams (1/2 cup) granulated sugar, 1 tub (8.8oz) mascarpone cheese, 2 tsp vanilla bean paste
When the egg yolks are fluffy, add ⅓ of the egg whites to the egg yolk mixture and mix them in to thin it out a bit. Then add another ⅓ of the egg whites and gently fold it in, repeating with the last ⅓.
If you're using a pan, you can skip this but if it's in a cup, I like to put a small dollop of the cream on the bottom of the cup before placing an Oreo down.
Submerge the Oreos in the espresso for 3-5 seconds and place them flat in a the cup or the serving dish (if using a pan, you can chop up some Oreos and fill in small gaps but it doesn't really matter).
32 Oreos**
Spread half of the mascarpone cream on top of the Oreos and then repeat with the second layer of Oreos and second half of the cream. Refrigerate the tiramisu for at least 8 hours. I like to do this the night before serving, especially with Oreos because they take longer to soften.
Dust with the cocoa powder a few hours before serving so it settles a little. Serve chilled.
cocoa powder for dusting