Pistachio Swirl Fudge

Yield:	50 Servings
Categories:	Microwave, Chocolate, Candies, Holiday, Christmas

1	pk	(3-oz.) cream cheese
1	cn	(14-oz.) sweetened condensed milk, divided
1/2	ts	Vanilla
3	pk	(6-oz. each) semisweet chocolate pieces
1	tb	Sweet butter or margarine
1/2	c	Coarsely chopped pistachio nuts