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 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 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 completely smooth and creamy, scraping down the sides as needed.
05 - Add granulated sugar and beat until fully combined. Mix in the egg, vanilla extract, and sour cream, beating just until blended. Avoid overmixing to prevent cracks.
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. Transfer to a wire rack to cool completely, then refrigerate for at least 1 hour before serving.
09 - Top each mini cheesecake with your choice of fresh berries, chocolate ganache, caramel sauce, whipped cream, or crushed toppings. Serve chilled.