01 - Preheat oven to 325°F. Line a 12-cup muffin tin with paper liners.
02 - Place one vanilla wafer cookie, flat side down, in the bottom of each liner.
03 - Beat cream cheese and granulated sugar in a large bowl until smooth and creamy.
04 - Add eggs one at a time, mixing thoroughly after each addition.
05 - Mix in vanilla extract, sour cream, flour, and salt until just combined.
06 - Divide batter evenly among muffin cups, filling each about three-quarters full.
07 - Bake for 16-18 minutes until centers are just set with a slight wobble.
08 - Let cool in pan for 10 minutes, then transfer to wire rack to cool completely.
09 - Mix sour cream and powdered sugar until smooth for optional topping.
10 - Spoon topping onto cooled cheesecakes, garnish with berries or preserves, and refrigerate for at least 30 minutes before serving.