Preheat your oven to 325 degrees Fahrenheit and prepare a 12-cup muffin tin with paper liners. Set aside.
In a bowl, combine the graham cracker crumbs and melted butter until the crumbs are moistened.
Add a heaping tablespoon of the crumb mixture into the bottom of each paper liner and press down to pack the crumbs together to form a crust.
Add the room temperature cream cheese to a large bowl and mix with a hand mixer on medium-high speed until creamy and smooth.
Add the sugar and mix well for about 3 minutes.
Add the eggs one at a time and mix well after each addition, scraping down the bowl to make sure everything is incorporated.
Add the sour cream, vanilla, lemon juice and zest, and mix well on low speed until well blended.
Divide the cream cheese mixture evenly between the 12 prepared cups and pour it in over the crusts.
Tap the muffin tin on the counter to help any bubbles rise to the surface, and then bake at 325 degrees Fahrenheit for about 20-23 minutes or until the edges of the cheesecakes are set and the middles have a slight jiggle.
Let the cheesecakes cool at room temperature until cooled, and then chill them for at least 3 hours or overnight.
Before serving, garnish with a swirl of whipped cream and some lemon zest or lemon slices. OR, use fresh berries and whipped cream, if desired.