01 - Preheat oven to 325°F. Line a 12-count muffin tin with paper liners.
02 - In a medium mixing bowl, combine graham cracker crumbs, granulated sugar, and melted butter. Blend until evenly moistened. Divide mixture among the liners and press firmly into the base to form a compact crust.
03 - In a separate bowl, beat cream cheese and granulated sugar with an electric mixer until smooth and creamy. Add egg, vanilla extract, and sour cream; mix until just combined, being careful not to overmix.
04 - Spoon cheesecake filling evenly over prepared crusts in the muffin tin. Bake for 16 to 18 minutes, or until centers are just set. Cool at room temperature for 30 minutes, then refrigerate for at least 1 hour.
05 - While cheesecakes chill, combine brown sugar, butter, heavy cream, and salt in a small saucepan over medium heat. Simmer, stirring constantly, until thickened for about 3 to 4 minutes. Remove from heat, stir in chopped pecans and vanilla extract, and allow to cool slightly.
06 - Spoon pecan pie topping over each chilled cheesecake. Return to refrigerator and chill an additional 15 to 20 minutes before serving.