Chocolate Swirl Cheesecake

1 6-oz pkg nestles morsels
1/2 cup sugar
1 1/4 cup graham cracker crumbs
2 tablespoons sugar
1/4 cup butter (melted)
2 8 oz pkg cream cheese
3/4 cup sugar
1/2 cup sour cream
1 teaspoon vanilla
4 eggs

combine over hot water, nestles and 1/2 cup sugar; heat until mixture is smooth.
remove from heat, set aside.
in small bowl, combine crackers, 2 tablespoons sugar and melted butter, mix well.
pat into pie pan
in large bowl, beat cream cheese until light and creamy
gradually beat in 3/4 cup sugar
mix in sour cream and vanilla
add eggs, beat well one at a time
divide mixture in 1/2
put chocolate in one half and pour into pie pan
pour plain on top
with knife swirl plain into chocolate to marbleize