Preheat oven to 325°F. Spray each cavity of a 12-count mini cheesecake pan well with nonstick cooking spray and set aside. If using a regular 12-count muffin pan, line each cavity with cupcake liners for easier removal.

Add the graham crackers to a blender or food processor and process until you have fine crumbs. Scoop the crumbs into a mixing bowl, add the melted butter and sugar, and mix until well combined.

Evenly distribute the mixture between all 12 cavities in the mini cheesecake pan, pressing each one down firmly into one even layer.

Bake at 325°F for 5 minutes, remove from the oven, and set aside to cool. Keep oven temperature at 325°F.

In the bowl of a stand mixer fitted with the paddle attachment, beat the cream cheese until smooth.

Add in the granulated sugar and mix until well combined. Add the lemon juice, lemon zest, and vanilla extract and mix until well combined.

Mix in the egg and egg yolk on low speed until just combined.

Evenly distribute the cheesecake filling between all 12 cavities of the mini cheesecake pan and return to the oven.

Bake at 325°F for 17-20 minutes or until the tops of the cheesecakes are set.

Remove from the oven and allow to cool at room temperature for at least 1 hour. Cover tightly with plastic wrap and transfer to the refrigerator to chill for at least 3-4 hours or overnight.

Once chilled, remove them from the pan. Top with whipped cream and fresh berries if desired, serve, and enjoy!