Remove the layer cake from the refrigerator and remove the ring by expanding it. Cover the entire cake with mascarpone whipped cream. Smooth out well and freeze until the cream sets (less than 10 min).
Repeat this operation 2 or 3 times to smooth the entire cake and obtain a clean finish. Use a spatula or a bench scraper to smooth, turning the cake with one hand and smoothing with the other, trying not to stop. This is the most difficult stage.
You can use a square or a cake scraper smoother. It smooths perfectly.
Chill in the fridge while you prepare the glaze above.
Once the glaze is warm, pour it over the top of the cake. Using a spatula, smooth the top quickly, letting the excess glaze fall down the sides of the cake.
If the glaze sets quickly on top, don't use a spatula. Pour the glaze over the sides of the cake to let it drip down.
Carefully remove the parchment paper from under the cake.
Once the glaze has set, decorate the top with rosettes of mascarpone whipped cream and place pieces of Kinder Bueno on top. I used the Wilton 1 M for the rosettes.
Keep refrigerated until ready to enjoy.