In the bowl of an electric mixer fitted with a paddle attachement, beat the cream chees unil smooth and creamy. Take care not to overbeat or you will incorporate too much air.
Add sugar to the cream ches and mix until creamy.
Add sour cream, vanilla and salt and stir until well-combined. Scrape down the sides of the mixer frequently.
With mixer on low speed, slowly add eggs, one at a time, and mix just until incorporated. Once all the eggs have been added, scrape down the sides of bowl and mix slowly until completley combined.
Fill each cupecake liner with about 1 tablespoon of the graham cracker crust mixture and press down with a glass bottom or back of spoon.
Pour the cheesecake mixture on top of the graham cracker crust filling about 3/4 full.
Bake for about 30 minutes, until the cheesecakes are slightly puffed and set. don't overbake or the texture will suffer. While the cheesecakes bake, prepare the sour cream topping.
Remove from overn and allow to cool for 5 minutes. Spoon 1-2 tablespoons of the sour cream topping over cheesec and smooth. Return to oven for 8-10 minutes.
Remove from oven and allow to cool for at least 15 minutes, then remove mini-cheesecakes from cupcake pan and place on wire rack. Allow to cool completely, 1-2 hours before refrigerating. Chill at least 3 hours, preferably overnight, before serving.