Preheat oven to 350 degrees. Grease an 8×8 inch square baking pan with cooking spray. Set aside.

In a medium bowl, mix together flour, baking powder and salt. Set aside.

In a medium microwave-safe bowl, heat the butter and chocolate at 30 second intervals, until melted. Stir together well.

Using a whisk, stir in brown and granulated sugars into the melted chocolate. Add in eggs and vanilla and continue to whisk until combined. Pour chocolate mixture into the bowl of dry ingredients.

Using a spatula, fold the chocolate mixture into the flour mixture, just until combined. Pour batter into the prepared baking dish. Bake for 25-30 minutes, or until a toothpick inserted comes out clean. Let brownies cool completely before topping with glaze.

For Chocolate glaze: In a small bowl, stir together powdered sugar, cocoa powder, vanilla and water. Stir until it is smooth and pourable. Pour glaze over the cooled brownies. Use the back of a spoon to spread evenly. Let stand (or place in fridge) until glaze is set. (About 30 minutes)

Cut into 9 squares and serve. Enjoy!