Preheat oven to 350 degrees F. Line an 8-inch square metal cake pan with parchment.
In large bowl, whisk together 4 tablespoons melted butter and the melted chocolate. Blend in granulated sugar, 1/4 cup brown sugar, and vanilla. Whisk in egg. Then stir in flour. Spread in pan and bake for 15 minutes, remove and leave oven on.
Heat 1/2 cup butter and 3/4 cup of the brown sugar in a medium saucepan over medium-high heat. Boil for 2 minutes. Pour over brownie base and bake 7 minutes more. Remove from oven and sprinkle with milk chocolate, let sit 5 minutes, and spread to cover the top. Dust with ground almonds and then pecans. Sprinkle with salt. Press down pecans. Cool, then freeze 30 minutes before cutting. Serve at room temperature.
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