Beat the butter until foamy, add sugar spoonfuls and one after the other the eggs. Stir in the flour, instant flakes and baking powder.
Grease a loaf pan and line the base with baking paper. Pour in the dough and smooth it out. Bake at 190 ° C for about 60 minutes (stick test).
Turn the fully baked, hot cake onto a wire rack and peel off the paper. Mix powdered sugar with orange and lemon juice and brush onto the cake with a brush until the liquid is completely absorbed.