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. Divide mixture among paper liners and press firmly to create an even 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. Distribute filling evenly over crusts.
04 - Bake in the preheated oven for 16 to 18 minutes or until centers are just set. Remove from oven, cool at room temperature for 30 minutes, and refrigerate for at least 1 hour.
05 - While cheesecakes chill, combine brown sugar, unsalted butter, heavy cream, and salt in a small saucepan. Set over medium heat and stir constantly until mixture simmers and thickens, about 3 to 4 minutes. Remove from heat, stir in chopped pecans and vanilla extract, and allow topping to cool slightly.
06 - Top each chilled cheesecake with pecan mixture. Refrigerate an additional 15 to 20 minutes before serving.