2Preheat your oven to 350°F (175°C) and grease a 9x9 inch baking pan.
In a medium bowl, whisk together the flour, baking powder, and baking soda. Set aside.
In a large bowl, melt the butter and let it cool slightly.
Add the sugar and brown sugar to the melted butter and mix until well combined.
Beat in the eggs, one at a time, until the mixture is smooth and glossy.
Stir in the espresso until fully incorporated.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Pour the batter into the prepared baking pan and spread it evenly.
Bake for 20-25 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
Allow the brownies to cool in the pan before cutting into squares and serving.