Mix the softened butter with the brown sugar, vergeoise, vanilla sugar, and egg.
Add the flour, baking powder, and the dark and white chocolate chopped into large chunks.
Form the mixture into a ball of dough and leave it in the refrigerator for 20 minutes.
Press half of the cookie dough into the bottom of an 18 cm cake ring.
Spread a layer of chocolate spread evenly over the dough.
Cover the spread with the remaining half of the cookie dough.
Bake in the oven for 22 minutes at 180°C (350°F).
Let the cookie cake cool completely before slicing and serving.
Cook it hands-free.
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