Preheat oven to 350 degrees. Coat a 9-inch square pan with nonstick cooking spray.
Whisk together butter and sugar. Stir in eggs one at a time, then vanilla. Gently stir in cocoa, flour, salt and baking powder. Spread batter into prepared pan.
Bake for 28-30 minutes. Cool for 10 minutes before cutting.
Enjoy!
Notes
TIPIf your batter seems a little stiff, you can add 1 Tbsp. milk to thin it out.The flavor of these brownies can be amplified by sprinkling a little salt on top of the batter, before baking.