Preheat oven to 350 degrees F (175 degrees C). In a medium bowl, combine graham cracker crumbs, melted butter, and sugar. Press into the bottom and sides of a 9-inch pie plate.
Bake for 8-10 minutes, or until lightly golden. Let cool completely.
In a large mixing bowl, beat cream cheese and powdered sugar together until smooth.
Add sour cream and vanilla extract and mix well.
Fold in 1.5 cups of the chopped Snickers bars.
Pour the filling into the cooled crust and spread evenly.
Refrigerate for at least 6-8 hours, or preferably overnight, until firm.
Once chilled, sprinkle the remaining 0.5 cup of chopped Snickers bars over the top.
Warm the caramel sauce slightly and drizzle over the pie. Melt the chocolate chips in the microwave in 30-second intervals until smooth, then drizzle over the pie.
Slice and serve.
Notes
This pie is best served cold. Store leftovers in the refrigerator.