In a medium-sized bowl, mix together the chocolate cake mix, melted butter, and one egg until it forms a soft dough. Press this mixture into the bottom of the 9x13" pan.
In another bowl, mix together the cream cheese, powdered sugar, cocoa, and remaining two eggs until smooth. Pour over top the cake mixture.
Bake for 40-50 minutes, until the tops and edges start to crack and turn a more golden brown.