01 - Preheat oven to 325°F. Line a standard 12-cup muffin tin with paper liners and set aside.
02 - In a medium bowl, combine the graham cracker crumbs, melted butter, and sugar. Stir until the crumbs are evenly coated and resemble wet sand.
03 - Divide the crumb mixture evenly among the 12 lined muffin cups, using about 1 tablespoon per cup. Press the crumbs firmly and evenly into the bottom of each liner using the back of a spoon or a small flat-bottomed glass.
04 - In a large mixing bowl, beat the softened cream cheese with an electric mixer until completely smooth and free of lumps. Add the granulated sugar and continue beating until well incorporated.
05 - Add the egg, vanilla extract, and sour cream to the cream cheese mixture. Beat on low speed until just combined and smooth. Avoid overmixing to prevent excess air in the batter.
06 - Spoon or pipe the cheesecake batter evenly into the prepared crusts, filling each liner about three-quarters full.
07 - Bake for 18 to 20 minutes, or until the centers appear almost set with a slight jiggle. Do not overbake—the cheesecakes will continue to set as they cool.
08 - Allow the mini cheesecakes to cool in the muffin tin for 10 minutes, then transfer them to a wire rack to cool completely. Refrigerate for at least 1 hour before serving.
09 - Before serving, top each mini cheesecake with your choice of fresh berries, chocolate ganache, caramel sauce, whipped cream, or crushed cookies and nuts.