Preheat oven to 350 degrees.
In a bowl, combine the sugar, cocoa powder, flour, and salt.
Mix in the butter, vanilla, and eggs. Stir to combine.
Grease and flour an 8x8 baking dish. Pour the batter into the baking dish. Bake for 30-35 minutes.
Let the brownies cool completely. Remove from the baking dish. Cut the entire thing in half into two rectangles. Then slice each rectangle into equally portioned triangles.
Decorate with the icing writers and m&m candies.