01 - Preheat oven to 325°F. Line a standard 12-cup muffin tin with paper liners.
02 - In a medium bowl, combine 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 approximately 1 tablespoon per cup. Press firmly into the bottoms using the back of a spoon or a small measuring cup to create a compact, even layer.
04 - In a large mixing bowl, beat the softened cream cheese with an electric mixer until smooth and creamy. Add the granulated sugar and continue beating until fully incorporated and free of lumps.
05 - Mix in the egg, vanilla extract, and sour cream, blending until just combined. Avoid overmixing to prevent excess air incorporation, which can cause cracking.
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—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 to allow the filling to fully set.
09 - Before serving, top each mini cheesecake with your choice of fresh berries, chocolate ganache, caramel sauce, whipped cream, or crushed cookies and nuts.