Preheat your oven to 180°C and line a square brownie pan with parchment paper.
In a bowl, whisk together the eggs with the sugar for 1-2 minutes. Then add the flour and salt and set aside.
Melt half the butter with the dark chocolate cut into pieces in a bain-marie and set aside in a container.
Do the same with the white chocolate and the other half of the butter and also place this preparation in a container.
Divide the first egg-sugar-flour mixture equally into the 2 containers containing the 2 chocolates. Incorporate the mixture of crushed nuts into the 2 preparations, one half with the dark chocolate brownie batter and another part for the batter. white chocolate brownie.
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