01 - Preheat the 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 mixture resembles wet sand and holds together when pressed.
03 - Divide the crumb mixture evenly among the 12 lined muffin cups. Using the back of a spoon or a small measuring cup, press the crumbs firmly into the bottom of each cup to form a compact, even crust layer.
04 - In a large bowl, beat the softened cream cheese and sugar together using an electric mixer on medium speed until completely smooth and creamy, scraping down the sides as needed.
05 - Add the egg and vanilla extract to the cream cheese mixture. Beat on low speed until just combined — avoid overmixing. Gently fold in the sour cream with a spatula until evenly distributed.
06 - Spoon or pipe the cheesecake filling evenly over each prepared crust, filling each cup nearly to the top. Smooth the surfaces with a small spatula or the back of a spoon.
07 - Bake for 18 to 20 minutes, or until the centers appear set but still have a slight jiggle when gently shaken. The edges should be lightly golden.
08 - Remove the tin from the oven and allow the cheesecakes to cool in the pan at room temperature for 15 minutes. Then transfer them to a wire rack to cool completely.
09 - Refrigerate the mini cheesecakes for at least 1 hour to allow the filling to fully set and develop its signature creamy texture.
10 - Top each chilled mini cheesecake with your choice of fresh berries, lemon curd, melted chocolate, caramel sauce, chopped nuts, crushed cookies, or fruit preserves. Serve immediately.