Preheat oven to 350°F.
Line a 9×13” pan with nonstick foil.
Melt butter and chocolate over low in saucepan.
Shut heat.
Whisk the eggs in a large bowl with sugar and salt.
Slowly whisk the chocolate into the egg mix and add vanilla.
Sift flour and cocoa in the batter, stir smooth.
Pour into pan.
Top with 15 oreos and press down a bit so they get covered with batter.
Bek 30-35 mins and cool.