Preheat the oven to 180 °C. Make the dough: in a bowl, mix the almond flour, psyllium, matcha powder, erythritol, baking powder, and salt.
Sift the dry ingredients so that there are no lumps. You can skip this step, but then the dough will be less fluffy.
Well, even perfectly, whip the cream and mix it with the butter, eggs, and vanilla. Combine the wet and dry ingredients. The dough will be very thick.
Cover the baking tray with parchment paper and lay out the dough. Make a large rectangle: put a second piece of parchment paper on top and flatten with a rolling pin.
Bake for 10 minutes. The cake will rise and become a little springy. It may begin to brown around the edges.
Take the cake out of the oven and let it cool, but not all the way through. Remove it from the sheet and, using a new sheet of parchment, gently and slowly roll it up. Allow the rolled up cake to cool completely.
For the cream, mix the softened butter and cheese, add the erythritol, and vanilla. Whip them into an airy cream.
Carefully unwind the roll and, with a silicone spatula (it is most convenient), pour in the cream. Smooth it out.
Roll it up and put it in the fridge for a couple of hours. Ideally, leave it there overnight.