In a medium bowl, sift together the sugar, cocoa powder, flour, salt, and baking powder.
In a large bowl, beat the eggs with the vanilla. Add in the butter and gently stir dry ingredients.
Prepare your 12-inch cast-iron skillet. (Everyone does this differently it seems, so just make sure you prepare it in a way that will ensure your brownies don't stick. I used a non-stick spray.
Pour ⅓ of your brownie batter into your prepared skillet.I used 19 Oreo's and placed them over the batter. Pour the remaining ⅔ of batter over Oreo's. Be sure to cover them all!
Bake for about 35 minutes. Because the skillet retains heat so well you will want to remove them a couple of minutes before they are completely done. I inserted a toothpick at 35 minutes and when it was removed there were a few tiny wet crumbs.
Optional: Top with ice cream and crushed oreo. I highly recommend eating directly from the pan! :)
Notes
The recipe video is not the correct amounts of ingredients. Please follow the written recipe above.