Crumble the corn flakes and place in a bowl, mix with the oat flakes and nuts. Add flour, baking powder, baking soda, cinnamon and salt and mix together.
Melt the butter in a small saucepan and let it cool.
Whisk the egg with the sugar and vanilla sugar.
Add the cooled butter, lemon juice and buttermilk to the egg mixture and stir in.
Gradually add the flour mixture to the egg mixture and carefully stir in until a viscous dough is formed.
Pour the dough into the molds and bake in the oven for about 20-25 minutes until golden brown.