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1
Preheat oven to 350F Line a 9x9-inch baking pan with aluminum foil and lightly grease.
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2
In a small, microwave safe bowl, melt 1 cup semisweet chocolate by microwaving in 30 second intervals and stirring frequently until chocolate is smooth.
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3
Repeat with 1 cup white chocolate in a second small bowl.
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4
Set aside.
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5
In a large bowl, cream together butter and brown sugar.
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6
Beat in the eggs one at a time, waiting until each is fully incorporated before adding the next.
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7
Beat in the vanilla, salt and flour, mixing just until all ingredients are combined and no streaks of flour remain.
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8
Transfer 2 cups of batter to a medium mixing bowl.
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9
Add the melted white chocolate and beat (by hand or with an electric mixer) to combine.
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10
Pour into prepared pan.
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11
Top evenly with remaining 1/2 cup semisweet chocolate chips and 1/2 cup white chocolate chips.
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12
Beat melted semisweet chocolate into remaining batter.
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13
Drop small dollops of chocolate batter on top of the chocolate chip layer, then use a spatula to gently spread the chocolate batter into an even layer.
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14
Bake for about 35 minutes, until a toothpick inserted into the center comes out with only a few moist crumbs attached.
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15
Allow to cool in pan, then lift the brownies out with the foil and slice into long, thin slices (12 slices by 3 slices).
