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1
Preheat oven to 350u00b0F.
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2
Spray a 9 x 9-inch pan with non-stick cooking spray.
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3
Combine the flour, baking powder and salt in a small bowl.
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4
Melt 1/2 cup of butter with the chocolate.
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5
Meanwhile, in the bowl of a mixer using a paddle attachment, beat the mascarpone, 6 tablespoons of softened butter, and the sugar until light and smooth.
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6
Add the eggs to the cheese mixture one at a time and thoroughly scrape the bowl after each egg is added.
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7
Add the vanilla and mix.
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8
Add the melted chocolate and mix just until combined.
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9
Finally, add the dry ingredients and nuts and mix slowly just until combined.
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10
Pour into the prepared pan and bake approximately 45 minutes or until a toothpick is inserted and comes out clean.
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11
The brownies will rise during the baking process, but after being removed from the oven will collapse to a normal height. Remove from oven and allow to cool.
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12
For the frosting, melt chocolate with butter and milk in saucepan.
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13
Allow to cool.
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14
Beat mascarpone until well combined.
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15
Beat in vanilla and melted chocolate mixture.
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16
Add in confectioners sugar, scraping down the bowl as you go.
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17
When it has all been incorporated, beat on high speed for 1-2 minutes, until icing is smooth.
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18
Frost brownies with icing.
