01 - Preheat oven to 325°F. Line a 12-cup muffin tin with paper liners.
02 - In a medium bowl, combine graham cracker crumbs, granulated sugar, and melted butter. Mix until evenly moistened, then divide mixture among liners and press firmly to create crusts.
03 - In a mixing bowl, beat softened cream cheese and granulated sugar until smooth. Add egg, vanilla extract, and sour cream, mixing until just incorporated. Spoon the filling evenly over prepared crusts.
04 - Bake for 16 to 18 minutes, until the centers are just set. Remove from oven and cool in the pan for 30 minutes at room temperature, then refrigerate for at least 1 hour.
05 - In a small saucepan over medium heat, combine brown sugar, unsalted butter, heavy cream, and salt. Bring to a simmer, stirring constantly, until the 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 the pecan topping over each. Place back in the refrigerator for 15 to 20 minutes prior to serving.