Beat the eggs with a mixer with sugar until the mass is detected 3 times.
Mix flour, cocoa, ground hazelnuts 150 gr. and baking powder.
Pour the dry mixture to the eggs and mix until smooth.
20 cm baking dish. Lubricate with oil, pour the dough and bake for 45-50 minutes at 180 degrees. Then put the finished cake on the wire rack and cool.
For cream, melt the chocolate, cool it to room temperature, and whisk together with nutella and soft butter. Cut the crust in half and brush with cream.
Sprinkle crumbled wafers on top of the cream. Lay the second half of the cake on top.
With the rest of the cream, lubricate the entire cake and on the sides. Sprinkle the board well with hazelnuts, and on top in a circle lay out the sweets cut in half.