For the brownie layers: – 8large egg – 3cupssugar – 16ouncesmelted butter – 1 1/2cupcocoasifted – 1teaspoonvanilla extract – 1 1/4cupfloursifted – 1/2teaspoonkosher salt – 1teaspoonbaking powder For the coconut filling: – 1cupwalnutsmeasure then finely grind in the food processor – 1 1/2cupunsweetened or sweetened coconut flake – 1cupheavy cream – 1cupsugar – 3eggs yolk – 5tablespoonsunsalted butterroom temperature For the vanilla buttercream: – 3sticksbuttersoftened – 8ozmascarpone cheesechilled – 2 1/2cupspowdered sugar – 1vanilla bean – pinchsalt For the chocolate ganache: – 8ouncessemisweet chocolatechopped – 2tablespoonslight corn syrup – 1cupheavy cream