Preheat oven to 350.
Butter a 9x13 inch baking dish.
Line with tinfoil and butter that too!
Measure out all your ingredients first. It makes the process easier.
Whisk together flour, baking powder and salt.
Bring water to a simmer.
Place chocolate and butter in a heat proof bowl.
Place over simmering water. Make sure the bowl does not touch the boiling water.
Stir to melt.
When the butter and chocolate are fully melted, use oven mitts to remove from heat.
Combine sugar, eggs, vanilla, and espresso powder.
Add flour mixture.
Whisk until smooth.
Pour into pan and bake for 30 minutes.
Remove from oven and let cool.
Pull the brownies out of the pan using the tinfoil.
Dust with powdered sugar.