Classic Brownies | America's Test Kitchen

Ingredients

• 1 cup pecans or walnuts (4 ounces/113 grams), chopped medium (optional)
• 1 1/4 cups plain cake flour (5 ounces/142 grams)
• 1/2 teaspoon table salt
• 3/4 teaspoon baking powder
• 6 ounces (170 grams) unsweetened chocolate , chopped fine
• 12 tablespoons unsalted butter (1 1/2 sticks), cut into six 1-inch pieces
• 2 1/4 cups sugar (15 3/4 ounces/447 grams)
• 4 large eggs
• 1 tablespoon vanilla extract