01 -
Preheat the oven to 175°C and grease an 8-inch square baking dish with non-stick spray or line it with parchment paper and then spray.
02 -
Melt the butter in a microwave-safe bowl using short intervals until fully liquid.
03 -
In a large mixing bowl, combine the melted butter, granulated sugar, eggs, vanilla extract, cocoa powder, flour, salt, and baking powder. Stir until the mixture is uniform and smooth.
04 -
Pour the batter evenly into the prepared pan and bake for 30 to 35 minutes. Insert a toothpick to check; it should come out with moist crumbs but no raw batter.
05 -
Allow the baked brownies to cool completely in the pan on a wire rack before frosting.
06 -
Dissolve the instant coffee granules into the heavy whipping cream and set aside.
07 -
Beat the unsalted butter until light and fluffy. Gradually add powdered sugar while mixing until fully incorporated. Add 30 ml of the coffee cream mixture and beat until combined. Add more cream one tablespoon at a time, adjusting to desired consistency.
08 -
Spread the frosting evenly over the cooled brownies. Slice into squares and serve.
09 -
Store brownies in an airtight container at room temperature for up to three days or freeze for longer preservation.