01 - Preheat oven to 325°F (165°C) and line a 12-cup muffin tin with paper liners.
02 - In a medium bowl, blend graham cracker crumbs, granulated sugar, and melted butter until mixture is evenly moistened. Divide mixture among paper liners, pressing firmly to compact into a crust.
03 - In a mixing bowl, beat cream cheese and granulated sugar until smooth. Add egg, vanilla extract, and sour cream; mix until just combined. Spoon filling evenly over the prepared crusts.
04 - Bake cheesecakes for 16 to 18 minutes, or until centers are just set. Allow to cool at room temperature for 30 minutes, then refrigerate for at least 1 hour.
05 - In a small saucepan over medium heat, combine brown sugar, unsalted butter, heavy cream, and salt. Stir constantly until mixture thickens, about 3 to 4 minutes. Remove from heat, stir in chopped pecans and vanilla extract, and let cool slightly.
06 - Once cheesecakes are chilled, spoon pecan topping over each one. Chill for another 15 to 20 minutes before serving.