Prepare a 9x13 inch pan by spraying it with non-stick spray and lining it with parchment paper.
Melt unsweetened chocolate and butter using a bain-marie method.
Sift flour and cocoa powder together.
Whip eggs and sugar to make an Italian meringue.
Incorporate melted chocolate and butter into the meringue.
Add miso, salt, vanilla extract, and other inclusions to the batter.
Fold in sifted flour and cocoa powder until just combined.
Layer the batter in the pan with dulce de leche and milk chocolate.
Sprinkle flake salt on top.
Bake at 350°F for about 50 minutes, or until a toothpick comes out with moist crumbs.
Let the brownies cool for at least 2 hours before slicing and serving.
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