In a bowl, combine the graham cracker crumbs, 1/4 cup sugar, and melted butter. Mix until the crumbs are evenly coated. Press the mixture firmly into the bottom of a 9-inch springform pan to create the crust. Bake for 10 minutes, then remove and let cool.
In a large mixing bowl, beat the cream cheese with 1 cup sugar until smooth. Add in the vanilla extract and mix well.
Add the eggs one at a time, beating well after each addition. Be careful not to overmix.
Gently fold in the sour cream until just combined.
In a small bowl, mix the sliced strawberries with the strawberry jam until the strawberries are well coated. Spread the strawberries evenly over the cooled crust.
Pour the cheesecake filling over the strawberries in the springform pan, smoothing the top with a spatula.
Bake in the preheated oven for 50-60 minutes, or until the center is set but still slightly wobbly. Turn off the oven and crack the door open, letting the cheesecake cool in the oven for about 1 hour.
Once cooled, cover the cheesecake with plastic wrap and refrigerate for at least 4 hours, or overnight if possible.
Once chilled, run a knife around the edge of the pan before releasing the springform. Top with whipped cream and garnish with fresh mint leaves before serving.