Preheat your oven to 350°F (175°C)
Grease an 8x8" (20x20cm) baking pan with butter or baking spray, or line with parchment.
In a large bowl, combine your butter, sugar, espresso powder, vanilla extract, and hawaij. Mix thoroughly so that the butter and sugar are well-combined. You can do this in a stand mixer if you'd like as well.
After the butter, sugar, espresso, vanilla, and hawaij are well blended add your eggs and mix again until the eggs are thoroughly combined.
Add the flour, cocoa powder, and salt, and stir until all dry ingredients are fully incorporated. Spoon into your lined baking pan and smooth out the top.
Place in the oven for 25-30 minutes, or until firm in the center. Let cool in the baking pan for 10 minutes before removing and cutting. Enjoy!