Prep : Grease the inside of a 9-inch springform pan with softened butter. Concentrate most of it on the bottom and then move it up the sides of the pan. Set aside.
Graham Cracker Crust : In a mixing bowl, stir together the graham cracker crumbs and melted butter until well combined. The mixture should look like wet sand. Firmly press it into the bottom of the prepared springform pan.
2 cups graham cracker crumbs, 6 tablespoons unsalted butter
Loosely cover the springform pan with plastic wrap to foil and place it in the freezer for 20 minutes.
Lemon Cheesecake Filling : In a large bowl add the granulated sugar and lemon zest. Use your clean hands to rub it together until it's very fragrant. About 1-2 minutes.
1 cup granulated sugar, 3 tablespoons lemon zest
Add the cream cheese, heavy whipping cream, lemon juice, and lemon extract (if using) into the bowl of sugar and lemon zest. Beat with an electric hand mixer until smooth and combined.
24 ounces full-fat cream cheese, 1/4 cup heavy whipping cream, 2 tablespoons freshly squeezed lemon juice, 1 teaspoon lemon extract
Using a silicone spatula, stir in the Cool Whip and mix until thoroughly combined.
8 ounces Cool Whip
Chill Time : Evenly spread the lemon cheesecake mixture into the springform pan over top the crust. Cover the springform pan with plastic wrap or foil and refrigerate for at least 6-8 hours, or overnight is the best (recommended).
Serve : Serve chilled from the fridge and garnish the whole cheesecake, or each slice, with whipped cream (store-bought or homemade) and a lemon slice.