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, stirring until the crumbs are evenly coated and resemble wet sand.
03 - Divide the crumb mixture evenly among the 12 lined muffin cups, using roughly 1 tablespoon per cup. Press each portion firmly into the bottom using the back of a spoon or a small measuring cup.
04 - In a large mixing bowl, beat the softened cream cheese with an electric mixer on medium speed until completely smooth and free of lumps.
05 - Add granulated sugar to the cream cheese and beat until well combined. Mix in the egg, vanilla extract, and sour cream, blending just until incorporated. 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 remaining. Do not overbake—the residual heat will finish setting the filling.
08 - Allow the mini 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 chilled mini cheesecake with your choice of fresh berries, chocolate ganache, caramel drizzle, whipped cream, or crushed toppings just before serving.