I searched for years for a brownie that was more ooey gooey than cake like and here it is. I make it in a 9X13 pan and it dissapears FAST. I found this on the back of a Hershey's Cocoa can and the icing is from a friend.
For brownies heat oven to 350 degrees. Spray a 9x13 pan with non stick cooking spray.
In large microwave safe bowl place butter and microwave until melted.
Stir in sugar and vanilla.
Add eggs one at a time, hand beating well with spoon after each addition.
Add cocoa; beat until well blended.
Add flour, baking powder and salt; beat well.
Stir in nuts if desired.
Pour batter into prepared pan and bake for 30 - 35 minutes (I underbake mine for 25 minutes).
Drop icing on hot brownies and spread with a rubber spatula as icing melts. Cool completely and cut into bars.
For icing. Melt butter then wisk in the cocoa, butter and powder sugar. Icing will be thick but will melt when placed on hot brownies and make like a thin chocolate coating. The brownies are still good without the icing but what the heck, go for it!