Step 1: Make the Crust
In a bowl, combine graham cracker crumbs and melted butter. Stir until the texture resembles wet sand. Press this mixture into the base of a 9-inch springform pan, using the back of a spoon or flat-bottomed cup to create an even layer. Chill in the fridge while you prepare the filling.
Step 2: Whip the Cream Cheese
Add softened cream cheese and powdered sugar to a large mixing bowl. Use a hand mixer (or stand mixer with paddle attachment) to beat until smooth, creamy, and lump-free.
Step 3: Add Lemon Flavor
Mix in fresh lemon juice and lemon zest. Scrape down the sides of the bowl as needed to ensure even mixing. You want the lemon flavor distributed evenly throughout.
Step 4: Fold in the Whipped Cream
Gently fold in the whipped cream or whipped topping with a spatula. Take your time here – use broad, slow movements to keep the mixture light and airy. No streaks should remain.
Step 5: Swirl in the Raspberries
Add mashed raspberries and fold them in just until they create pink streaks throughout the filling. Do not overmix, you want the raspberry ribbons to show.
Step 6: Assemble and Chill
Pour the cheesecake mixture into the prepared crust. Smooth out the top with a spatula. Refrigerate for 6 hours or overnight. If you are short on time, you can refrigerate for 2-3 hours and then freeze for 2-3 hours. For a firmer set, freeze only for 3-4 hours.
Before serving, decorate with dollops of whipped cream, fresh raspberries, and lemon slices.