In a bowl, mix graham cracker crumbs, sugar, and melted butter until well combined. Press the mixture firmly into the bottom of the pan and about 1 inch up the sides. Bake the crust for 10 minutes.
Place the springform pan into a larger baking dish. Pour hot water into the larger dish until it reaches halfway up the side of the pan.
Mix the cornstarch with water to create a slurry, then stir it into the saucepan. Cook for about 2 minutes until the sauce thickens.