01 - Preheat the oven to 325°F (160°C). Line a standard 12-cup muffin tin with paper liners.
02 - In a medium bowl, combine the graham cracker crumbs, melted butter, and sugar. Stir until the crumbs are evenly moistened and resemble wet sand.
03 - Divide the crumb mixture evenly among the 12 muffin cups, using about 1 tablespoon per cup. Press firmly into the bottom of each liner using the back of a spoon or a small measuring cup.
04 - In a large bowl, beat the softened cream cheese with an electric mixer until completely smooth and creamy. Add the granulated sugar and beat until well incorporated.
05 - Mix in the egg, vanilla extract, and sour cream, blending until just combined. 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, until the centers are nearly set with a slight jiggle. Do not overbake, as the cheesecakes will continue to set as they cool.
08 - Allow the cheesecakes to cool in the muffin tin for 10 minutes, then transfer to a wire rack to cool completely. Refrigerate for at least 1 hour before serving.
09 - Before serving, garnish each mini cheesecake with your choice of fresh berries, chocolate ganache, caramel sauce, whipped cream, or crushed cookies and nuts.