1 8-oz package cream cheese, softened
1/2 c butter, softened
3/4 c powdered sugar
   2 tbsp brown sugar
1/2 tsp vanilla extract
3/4 c mini semisweet chocolate chips
3/4 c finely chopped pecans

In a medium bowl, beat together cream cheese and butter until smooth.  Mix in powdered sugar, brown sugar and vanilla.  Stir in chocolate chips.  Cover, and chill in the refrigerator for 2 hours.  Shape chilled cream cheese mixture into a ball.  Wrap with plastic, and chill in the refrigerator for 1 hour or overnight.  Roll the cheese ball in finely chopped pecans before serving.  Serve with chocolate graham crackers.