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1
Preheat oven to 325u00b0F; have ready a buttered 8-inch square glass cake pan.
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First, prepare the brownies.
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In a small saucepan, melt the butter and bring it to just below a boil; have the chopped chocolate in a mixing bowl--pour the hot butter over the chocolate and let stand for 30 seconds.
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Stir until chocolate is completely melted.
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Sift in the sugar and cocoa powder (I do this through a sieve, not with a sifter).
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6
With a wooden spoon, beat in the mascarpone, eggs (30 minutes on the counter brings them to room temperature) and vanilla, mixing until smooth.
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7
Gently fold the flour and salt into the batter.
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Pour batter into prepared pan and spread evenly--this is important since, if the batter isn't spread evenly, it won't bake evenly.
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Place into preheated oven and bake for 45 to 50 minutes, or until a tester comes out clean (45 minutes did it for me).
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10
Place pan on a cooling rack and let brownies cool for 10-15 minutes, while you now make the ganache.
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11
Place chopped chocolate in a mixing bowl; in a small saucepan, bring the cream and the butter to just below the boiling point, over medium heat.
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Pour this hot cream-butter mixture over the chocolate and let stand for 30 seconds, then stir until smooth; ganache is now ready to use and can be spread over the brownies.
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13
Should you wish to wait a bit, make sure the ganache is warm when you spread over the brownies, as it does firm up which makes spreading hard to do.
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14
Don't cut into the brownies until ganache has firmed up; I find it best to put the brownies into the fridge to speed this along; once the ganache is firm the brownies do not need to be kept in the fridge, though.