Preheat oven to 350. Grease 8x8 baking square.

Hand mix flour, cocoa, baking powder, baking soda, and salt in medium bowl until well blended. Set aside.

Soften butter. In large bowl, mix butter and sugar on medium speed until blended and creamy.

While mixing sugar, add eggs one at a time until blended. Mix in vanilla extract.

Add flour mixture into sugar mixture. Stir with wooden spoon until blended.

Pour brownie batter into baking dish. Smooth top with rubber spatula.

Bake 25-30 minutes or until toothpick inserted into center comes out clean. Let cool completley then serve.