Grease a 9” springform pan and line the bottom with parchment paper.
Preheat the oven to 325°F.
In a medium mixing bowl, stir together graham cracker crumbs, melted butter, and ⅓ cup granulated sugar until thoroughly combined.
Press graham cracker mixture into the springform pan, creating a thick, even layer across the bottom and about halfway up the sides of the pan. Pack down the crumbs so that the crust holds together. Set aside.
In a medium mixing bowl, beat the cream cheese with a hand mixer (or standing mixer) until light and fluffy.
Add 1 cup of granulated sugar and continue beating for 1 minute.
Add flour, lemon extract, and vanilla extract to the mixture and combine.
Beat in sour cream, heavy cream, lemon zest, and lemon juice. Mix just until combined.
By hand, mix in the eggs, one at a time. Stir gently to prevent extra air from getting into the mixture.
Pour cheesecake mixture into the prepared graham cracker crust and spread the top smooth.
Wrap the springform pan in aluminum foil (to prevent water from getting in) and place the pan into a larger vessel that can hold water at least 1” up the sides of the pan.
Fill with water to create a water bath for the cheesecake.
Bake for 45 minutes. After 45 minutes, turn off the oven, keeping the door closed for 20 minutes. After this 20 minutes, crack the oven door and leave the cheesecake in place for another 20 minutes.
Remove the cheesecake from the oven. Allow to cool the rest of the way and then transfer to the refrigerator to chill for at least 2 additional hours.
Top with dollops of whipped cream and/or berries or lemon slices and serve.
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Notes
Store any leftovers covered in the refrigerator for up to 5 days or freeze for up to 1 month.
Mix the eggs into the batter by hand; mixing too vigorously adds air to the batter which will result in the cheesecake rising during the bake and subsequently cracking while cooling.
The springform pan isn’t water-tight, so wrap it well - you must use a double layer of aluminum foil - to keep the water from the water bath out.
Instead of layering aluminum foil and placing the springform pan in water, set a pan of warm water on the shelf beneath the cheesecake throughout baking.