Mix the warm water and espresso powder in a small bowl and set aside.
In a large bowl and using an electric mixer or a whisk, beat sugar and butter until fluffy. Add eggs, vanilla extract, and water-espresso mixture. Beat until all combined. Add the melted chocolate and mix again.
Mix the dry ingredients in another bowl: cocoa powder, all-purpose flour and salt. Add this to the wet ingredients and mix until just combined. Do not overmix.
Frost the brownies with cream cheese and top with more gingersnap crumbs.
To make gingersnap crumbs, place them in a food processor and pulse until finely crushed.
Ovens differ from each other, so see what works on you. It takes about 15 minutes for my oven to reach 350 F (depending on how much heat it has). I used an oven with the fire from the bottom only so I always rotate the pan in the middle of baking.
These are best eaten after storing in the fridge.
I am using the UK measuring cups.