Preheat the oven to 325°F (160°C).
In a bowl, combine graham cracker crumbs and melted butter.
Press the mixture into the bottom of a springform pan to form the crust.
Bake for 10 minutes, then let it cool.
In a mixing bowl, beat the cream cheese and sugar until smooth.
Add vanilla extract and mix well.
In another bowl, whip the heavy cream until soft peaks form.
Fold the whipped cream into the cream cheese mixture gently.
Stir in the strawberry puree and gelatin (if using).
Pour the filling over the cooled crust and smooth the top.
Chill in the refrigerator for at least 4 hours.
Before serving, garnish with fresh strawberries.