PREHEAT oven to 375º F.
COMBINE crumbs, 1/4 cup pecans and brown sugar in 9-inch pie plate. Stir in butter until moistened; press onto bottom and up side of pie plate.
BAKE for 8 minutes. Cool completely in pie plate on wire rack.
CHOP 4 ounces (1 bar) chocolate into small pieces. Beat cream cheese and marshmallow cream in large mixer bowl for about 2 minutes or until light and fluffy. Fold in chopped chocolate. Spoon into cooled crust. Refrigerate for 1 hour.
BREAK 4 ounces (1 bar) chocolate into small pieces into medium bowl. Microwave cream in 1-cup glass measure on HIGH (100%) power for 40 seconds or until boiling. Pour over chocolate; let sit for 1 minute. Stir until smooth. Cool for 10 minutes. Pour over pie and smooth evenly. Sprinkle remaining pecans near edge of pie. Refrigerate for 2 hours or until firm.