Set the oven to 350F

Spray a 9x9 square baking sheet with baking spray, and (this is optional) line with parchment paper with overlapping ends so it will be easier to lift out for cutting.

Cut the butter up into chunks and put it in a large microwave safe mixing bowl. Zap it for a minute in the microwave until the butter is melted.

Whisk in the eggs, one at a time. Add the extract.

In a separate bowl whisk together the dry ingredients. Sift the cocoa if it has alot of lumps.

Gently mix the dry ingredients into the wet, stirring just until everything is well combined.

Spread the batter in the pan, and take a moment to even out the surface.

Bake for about 35-40 minutes, until the brownies are risen, slightly dry along the edges, and a toothpick inserted in the center doesn't have wet batter on it. (Moist crumbs are ok) Don't over-bake.

Let cool slightly and dust with powdered sugar. Cut into four large squares.