Pre-heat oven to 325° F. Lightly grease an 8 x 8-inch baking pan. Thoroughly combine all brownie ingredients, except powdered sugar, in a large mixing bowl. Pour batter into prepared pan. Bake for 35 to 40 minutes or until a toothpick inserted into the center comes out clean. Cool completely. Dust with powdered sugar; cut into bars. Makes 16 bars.