Yes. Make that a heaping 1/2 cup. For both the brownie part, and also the frosting part. There's no going back. (and if any of you know why, in my rush to capture the moment, my kitchen turns my pictures a yellow-ish hue, feel free to elaborate. The flash turns everything a shocking and stark white)
1/2 pound margerine (two sticks)
2 cups sugar
1/3 cup baking cocoa (read: 1/2 heaping cup)
add four eggs, beating well after each.
1-1/2 cups flour
1/4 tsp salt
2 tsp vanilla
Spread on a greased jelly roll pan and bake for 20 minutes.
Cool. (until you can't stand the wait)
then FROST with this:
1 stick margerine
1/3 cup cocoa (please.)
5 cups powdered sugar
4-5 TBSP milk