Preheat your oven to 180°C.
In a bowl, whisk the eggs with the powdered sugar. When the mixture becomes frothy, add the flour and baking powder little by little.
Melt the butter with the peanut butter and add it gently to the previous mixture with a pinch of salt. Make sure to stir well while you slowly pour in the melted butter so as not to cook the eggs in the mixture.
Divide the dough into 2 equal parts in 2 bowls.
In the first bowl, add the vanilla sugar and mix.
Gently melt the chocolate with the milk and pour into the mixture in the second bowl. Add the chocolate spread and mix until smooth and shiny.Butter and flour a cake tin. Pour in the 2 doughs, alternating colors, a large spoonful of each at a time.Bake for 35 minutes, and check with a knife blade to make sure it comes out clean. Let cool and unmould before enjoying!
