Farm Stand Brownies

From Bon Appetit.

• Ready In: 40 mins
• Serves: 16

Ingredients

• 3 1⁄2 cups  semi-sweet chocolate chips
• 1  cup butter
• 1 1⁄2 tablespoons instant espresso powder
• 1  tablespoon vanilla
• 1⁄2 cup flour, plus
• 1  tablespoon flour
• 1 1⁄2 teaspoons baking powder
• 1⁄2 teaspoon salt
• 1 1⁄2 cups  chopped walnuts
• 3  eggs
• 1  cup sugar, plus
• 2  tablespoons sugar

Directions

1. Heat oven to 350°F.
2. Line a 13x9 pan with foil and butter the foil.
3. Place chocolate chips and butter in a saucepan and stir constantly over medium-low until melted and smooth. Add espresso powder and vanilla and stir. Cool 15 minutes.
4. Whisk flour, baking powder, and salt in a small bowl. Add walnuts and toss to coat.
5. Whisk eggs and sugar in a large bowl just to blend. Add chocolate mixture and stir to blend. Add flour mixture and stir to just blend. Pour into pan.
6. Bake until a tester comes out with moist crumbs, about 35 minutes.
7. Cool completely. Cover and chill for 6 hours. Remove from pan to work surface. Cut into 16 pieces.