Melt the fat in a pot and heat to boiling hot. Add oat flakes and mix everything well. Pour into a mixing bowl and let it cool down.
Line three to four baking trays with baking paper. Beat the eggs, sugar, vanilla sugar and 1 pinch of salt with the whisk of the hand mixer for about 4 minutes until foamy. Fill onto the oat flakes. Mix flour and baking powder, also add and mix everything with the hand mixer.
Using two teaspoons, spread approx. 70 piles of dough on the baking trays and press them slightly flat (approx. 5.5 cm Ø). Bake in the preheated oven (electric oven: 175 °C/circulating air: 150 °C/gas: level 2) one after the other for about 15 minutes.
Remove the biscuits from the tray and let them cool down on a cake rack.
Dice the nougat and melt in a hot water bath. Pour into a disposable piping bag and cut off a small corner at the bottom. Spray nougat in strips onto the biscuits. Chill for at least 1 hour.