Whisk dry ingredients together.
Add melted butter, eggs, vanilla and espresso, then mix until smooth.
Pour into a lined 9x9 tray and bake at 175°C for 20–25 minutes or until a knife comes out clean.
For icing, mix all ingredients until smooth and spreadable.
Spread icing over hot brownies straight from the oven, let cool completely, chill until set, then slice into squares.
