Prepare the Crust: In a medium bowl, combine the graham cracker crumbs and melted butter until the mixture resembles wet sand. Press the mixture firmly into the bottom of a 9x9 inch baking dish to form an even layer. Place in the refrigerator to set while you prepare the filling.
Make the Cheesecake Filling: In a large mixing bowl, beat the softened cream cheese with an electric mixer on medium speed until smooth and creamy, about 2 minutes. Gradually add in the powdered sugar and vanilla extract, mixing until well combined.
Whip the Cream: In a separate bowl, whip the heavy cream until stiff peaks form, approximately 3-4 minutes. Gently fold the whipped cream into the cream cheese mixture until fully incorporated and fluffy.
Layer the Filling: Pour half of the cheesecake filling over the prepared crust and smooth it out evenly. Arrange half of the sliced strawberries on top. Spread the remaining cheesecake filling over the strawberries and smooth it out.
Add Strawberry Preserves: Dollop the strawberry preserves evenly over the top of the cheesecake filling and use a knife or spatula to swirl it gently into the cheesecake.
Chill: Cover the dish with plastic wrap and refrigerate for at least 4 hours, or overnight, until set.
Serve: Once chilled and firm, remove the cheesecake from the refrigerator and cut into bars. Garnish with additional fresh strawberries and mint leaves if desired.