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1
Position a rack in the lower third of the oven and preheat the oven to 325F.
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2
Cut an 8 by 16-inch piece of parchment paper.
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3
Lightly butter an 8 by 8 by 2-inch pan and line it with the parchment, allowing it to extend evenly over the opposite sides.
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4
Butter the parchment including the paper on the sides of the pan.
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5
Place the chocolate and butter in a large heatproof bowl set over a pot of gently simmering water and stir occasionally until melted and smooth.
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6
Remove from the heat.
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7
With a large rubber spatula or wooden spoon, beat the sugar and salt into the chocolate mixture.
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8
Beat in the eggs one at a time.
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9
Add the flour and mix vigorously until the batter is very glossy and pulls away from the sides of the bowl.
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10
Break the nuts into large pieces over the batter and fold them in.
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11
Pour the batter into the prepared pan and tap the pan bottom on the countertop to level the batter.
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12
Bake for 30 to 35 minutes, or until a skewer inserted in the center comes out moist but clean.
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13
Let cool in the pan on a cooling rack for 10 minutes.
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14
Remove the brownies from the pan using the parchment handles, and cool completely on the rack before cutting into 2-inch squares.