Preheat oven to 325 degrees. Grease the sides and bottom of an 8″ square pan with butter and dust lightly with flour.
Melt the chocolate and 8 oz. of butter together in a double boiler or a small bowl over a pot of simmering water.
Meanwhile, whisk the eggs and sugar together in a large bowl until the mixture is light, fluffy, and pale yellow.
Whisk in the VIA packet, cardamom, vanilla, and salt until well combined.
Remove the melted chocolate mixture from the heat and gently stir with a rubber spatula.
Very slowly add the chocolate to the egg mixture and mix thoroughly until well combined.
Sift the 2/3 cup flour into the batter and mix well.
Pour the brownie batter into the prepared pan.
Bake for approximately 25 minutes. Check the doneness by sticking a toothpick in the middle – if it comes out clean, the brownies are done.
Cool before cutting.
Serve dusted with powdered sugar.