Preheat oven to 350°F. Line a 9x9-inch pan with parchment and spray with cooking spray.
Melt butter and chocolate over a double boiler, then whisk in 1 cup sugar. Whisk eggs with remaining sugar, then combine with chocolate mixture. Fold in flour and salt, then bake for 35-40 minutes.
Cool brownies completely. Prepare ganache by heating cream and whisking in chopped chocolate until smooth. Chill until firm.
Cut brownies into 6x3 strips. Pipe ganache over brownies to resemble mummy wrapping, then place 2 eyeballs on each.
Notes
Use a piping bag for neat mummy wrapping and place eyeballs carefully for a spooky effect.