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1
Position a rack in the middle of the oven and preheat to 350 degrees F. Grease a 9-by-13-inch baking dish and line it with foil.
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2
Grease the foil.
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3
To make the cream cheese mixture, in a bowl, beat together the cream cheese, sugar, vanilla and egg yolk together in a small bowl until evenly blended and smooth.
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4
In a saucepan, warm the butter and chocolate over low heat, stirring often, just until melted.
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5
Remove from the heat and whisk in the sugars.
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6
Whisk in the eggs slowly, beating well.
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7
Whisk in the vanilla and salt.
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8
Sift the flour and cocoa over the chocolate mixture and, using a rubber spatula, stir in until just blended.
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9
Pour about 3/4 of the brownie batter into the prepared dish, spreading it into an even layer.
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10
Drop half the cream cheese mixture, in spoonfuls, over the batter.
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11
Top with the remaining brownie batter, in spoonfuls, and then the remaining cream cheese filling.
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12
Use a butter knife to gently swirl the brownie batter and cream cheese filling, creating a marbled effect.
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13
Bake until a toothpick inserted into the center comes out almost completely clean, about 25 to 30 minutes.
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14
Let cool for 15 minutes in the dish, then remove from the dish using the foil to lift them out; let cool completely on a wire rack.
