-
1
Position an oven rack on the middle rung.
-
2
Heat the oven to 350u00b0F.
-
3
In a medium saucepan over medium heat, heat the butter and brown sugar, stirring frequently, until the sugar has dissolved.
-
4
Cook, stirring, about 1 minute longer--the mixture will bubble but should not boil.
-
5
Set the pan aside to cool for about 10 minutes.
-
6
Meanwhile, butter an 8-inch square pan, line the pan bottom with parchment (or waxed paper), and then butter the parchment.
-
7
Stir the egg, egg yolk, and vanilla into the cooled sugar mixture.
-
8
Add the flour, salt, and nuts, stirring just until blended.
-
9
Pour the batter into the prepared pan.
-
10
Bake until the center is springy when touched (the top may still look doughy) and a toothpick inserted in the center comes out clean (it's fine if there are a few moist crumbs clinging to it), 25 to 35 minutes.
-
11
Set the pan on a rack until it's cool enough to handle.
-
12
Run a paring knife around the inside edge of the pan and then invert the pan onto a flat surface and peel off the parchment.
-
13
Flip the baked brownie back onto the rack to cool completely.
-
14
Cut into squares with a sharp knife.
-
15
This recipe can be doubled easily; use a 13x9-inch pan and increase the baking time slightly.
