Ive been cooking it for 20 years and I’ve never failed. The fastest and tastiest cake Ive ever eaten

I’ve been cooking it for 20 years and I’ve never failed. The fastest and tastiest cake I’ve ever eaten!
Ingredients:
for the cake top:
eggs - 6 pieces
salt - 2 g (0.07 oz)
sugar - 80 g (2.82 oz)
flour - 90 g (3 oz)
baking powder - 4 g (0.14 oz)
hazelnuts - 150 g (5.3 oz)
Tray size 24 X 24 cm (9.45 x 9.45 in)
IN THE OVEN 180 °C (356 °F)/30 minutes
for the pastry cream:
eggs - 4 pieces
sugar - 100 g (3.5 oz)
salt - 2 g (0.07 oz)
starch - 120 g (4.23 oz)
milk - 1.2 l (40.76 fl oz)
soft butter - 200 g (7 oz)
TO COLD 15 MIN
dark chocolate - 200 g (7 oz)
cocoa - 15 g (½ oz)
ground hazelnuts - 150 g (5.3 oz)
vanilla sugar - 8 g (0.29 oz)
for the cream:
whipping cream - 400 ml (13.5 fl oz)
powdered sugar - 80 g (2.82 oz)
cheese cream - 300 g (10.6 oz)
for decoration:
white chocolate - 60 g (2 oz)
TO COLD 4 H
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