"Brown butter is simply butter that has been cooked until it takes on a delicious, subtle nutty flavor and aroma -- which explains its French name, beurre noisette, or "hazelnut butter." Be sure to keep an eye on it as it cooks, to avoid burning...."
INGREDIENTS
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1 1/4 cups (2 1/2 sticks) unsalted butter, plus more for pan
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2 1/4 cups all-purpose flour, plus more for pan
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1 1/2 teaspoons baking powder
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1 1/2 teaspoons salt
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2 cups packed light brown sugar
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1/2 cup granulated sugar
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3 large eggs
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2 1/2 teaspoons pure vanilla extract
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1 cup chopped walnuts (about 4 ounces)
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1 cup toffee bits