Preheat the oven to 350°F (175°C).

In a mixing bowl, cream together the butter, sugar, and brown sugar until smooth.

Beat in the eggs one at a time, then stir in the vanilla.

Combine the flour, cocoa powder, baking soda, and salt; gradually blend into the creamed mixture.

In another bowl, beat the cream cheese with powdered sugar and vanilla until smooth.

Drop spoonfuls of cookie dough onto a baking sheet, then place a dollop of cream cheese filling on top.

Cover with more cookie dough and bake for 10-12 minutes.

Let cool before serving.