Separate two eggs, putting each white in a separate bowl (discard yolks); set aside.

In a small mixing bowl, beat butter and 3/4 cup sugar until crumbly.

Add the whole egg, one egg white and vanilla; mix well.

Combine flour and cocoa; add to egg mixture and beat until blended. Pour into a 9 inch square baking pan coated with non-stick spray. Set aside.

In another mixing bowl, beat cream cheese and remaining sugar until smooth.

Beat in the second egg white. Drop by rounded tablespoons over the batter; cut through batter with a knife to swirl.

Bake at 350 F. for 25-30 minutes or until set and edges pull away from sides of pan. Cool.