Prep & Preheat. Preheat your oven to 325°F and grease a 9-inch springform pan. Wrap the outside in foil to prevent leaks.
Make the Crust. Combine 1 ½ cups graham cracker crumbs, 2 tbsp sugar, and 5 tbsp melted butter. Press firmly into the bottom of the pan and bake for 8–10 minutes until set. Set aside to cool.
Make the Filling. Beat together cream cheese (softened) and sugar until smooth. Then add lemon zest, lemon juice, sour cream, vanilla extract, and mix until fully combined. Add eggs one at a time, mixing on low until just incorporated. Stir in ¼ cup heavy cream, if using, until smooth.
Bake & Cool. Pour filling on the crust. Bake for 55–65 minutes until edges are set and the center jiggles slightly. Turn off the oven, crack the door, and let the cheesecake cool in the oven for 1 hour. This helps prevent cracks.
Chill. Refrigerate for at least 4 hours or overnight for best results.
Serve. Release from pan, top with whipped cream, fresh lemon slices, or a lemon glaze.