Preheat your oven to 350°F (175°C). Prepare an 8x8-inch baking pan by greasing it or lining it with parchment paper.

In a large mixing bowl, whisk together the unsweetened cocoa powder, granulated sugar, all-purpose flour, and a pinch of salt until well combined.

In a separate bowl, melt your unsalted butter until just melted. Allow it to cool slightly, then whisk in the large eggs until glossy and smooth.

Pour the wet mixture into the bowl of dry ingredients, and gently fold together until just combined.

Spread the brownie batter evenly into your prepared baking pan and bake for 25 to 30 minutes.

Once baked, remove the brownies from the oven and place them on a wire rack to cool completely, about 30-45 minutes. Decorate with white icing to create mummy wrappings.