Instructions:

Prepare the Crust:
Preheat your oven to 325°F (165°C).
In a medium bowl, combine the graham cracker crumbs, sugar, and melted butter. Mix until fully combined.
Press the mixture into the bottom of a 9-inch springform pan. Use the back of a spoon to pack it tightly.
Bake the crust for 8-10 minutes, then set it aside to cool.

Prepare the Cheesecake Filling:
In a large bowl, beat the cream cheese until smooth and creamy.
Add the sour cream, powdered sugar, and vanilla extract, and mix until combined.
Add the eggs one at a time, mixing after each addition.
Stir in the mashed bananas and heavy cream.
Pour the cheesecake batter into the cooled crust and smooth the top.

Bake the Cheesecake:
Place the cheesecake into the oven and bake for 45-50 minutes or until the center is set (it may still jiggle slightly).
Turn off the oven and let the cheesecake cool in the oven for 1 hour.
After cooling, transfer it to the refrigerator to chill for at least 4 hours, or overnight for best results.

Top the Cheesecake:
Once the cheesecake is chilled, spread the strawberry jam or strawberry sauce over the top of the cheesecake.
Decorate with sliced banana, a dollop of whipped cream, and a sprinkling of crushed graham crackers.