3/4 cup all-purpose flour

1 cup granulated sugar

3/4 cup unsweetened cocoa

1/2 cup packed brown sugar

1/2 teaspoon baking powder

1/4 teaspoon salt

1 cup bittersweet chocolate chunks divided

1/3 cup milk

6 tablespoons butter, melted

1 teaspoon vanilla extract

2 large eggs, lightly beaten

1/2 cup chopped walnuts, divided

cooking spray

Measure the flour carefully, place the dry ingredients in a bowl, and whisk to combine. Combine the wet ingredients and stir until smooth. Mix the dry ingredients in with the wet. Pour the batter into a 9-inch square metal baking pan coated with cooking spray; sprinkle in the remaining 1/4 cup nuts. Bake at 350 degrees for 20 minutes or until a wooden pick inserted in the center comes out with moist crumbs on it. Cool in the pan on a rack. Cut into squares.