Combine 1 cup frozen fruit, 1/4 cup sugar, & 1 tbsp of cornstarch + 3 tbsp water mixed into a slurry. Heat over medium heat until simmering & reduce heat to cool
For the cheesecake:
Preheat oven to 325 F. Combine graham crackers and butter and transfer into a parchment lined 9x5 baking dish. Pack in with a spoon to form the layer of crust. Bake for 20 mins and let cool once finished while you prepare the cheesecake filling.
Combine cream cheese, egg, vanilla and sugar in a large bowl and mix until smooth. Pour the batter over the baked crust and add your fruit topping if you choose to at this time. Swirl in gently with a knife.
Bake for 40-45 mins until the toothpick inserted in the center comes out mostly clean. Remove cheesecake by lifting it out of the pan by the parchment paper.
Chill in the refrigerator for at leat 1 hour before slicing and serving