Preheat the oven to 325°F and line a 12 cup muffin tin with liners, lightly greasing if using paper.
Mix graham cracker crumbs with sugar and melted butter, press firmly into liners, and bake for 5 to 7 minutes until set.
Beat cream cheese until smooth, mix in sugar, then add eggs one at a time, followed by vanilla and sour cream.
Fill crusts about three quarters full and bake for 18 to 20 minutes until edges are set and centers jiggle slightly.
Melt butter and whisk with brown sugar, corn syrup, eggs, and vanilla, then fold in chopped pecans.
Spoon topping over cheesecakes and bake again for 7 to 10 minutes until bubbly and set.
Cool briefly, then chill for at least 2 hours before garnishing and serving.