Lightly spray a 9-inch round springform pan with nonstick cooking spray.
In a medium bowl stir together the graham crumbs, sugar and melted butter.
Press the mixture into the bottom of the springform pan (I like to use the back of a dry measuring cup) forming a slight lip around the edge about 1/2 inch tall.
Put the base in the freezer as you make the filling.
Cheesecake Filling
In a large bowl, beat the cream cheese until smooth.
Beat in the powdered sugar, lemon juice and vanilla extract.
Using a rubber spatula, gently fold in the whipped topping until the mixture looks smooth.
Spoon the batter into the prepared crust, and smooth the top.
Place in the fridge to chill for at least 6 hours, or overnight.
Blueberry Topping
Add the blueberries, sugar, lemon juice and 1/4 cup water to a medium saucepan over low-medium heat.
Gently stir the mixture as it begins to boil gently. The blueberries will start to soften. Boil for 5 minutes while stirring.
In a small cup, dissolve the cornstarch in the 2 tablespoons of water.
Add the cornstarch mixture to the blueberries, gently stirring as the mixture thickens.
Once the blueberry sauce looks thick and no longer watery, remove from the heat and cool fully. The sauce will continue to thicken as it cools.
Serving the Cheesecake
Take the cheesecake out of the fridge. Trace around the inside of the springform pan with a thin, sharp knife. Then unclamp the pan.
Top the cheesecake with the cooled blueberry topping, and optionally decorate with whipped cream.
Notes
*If you don't like whipped topping, measure 1 cup of whipping cream. Beat the cream until stiff peaks form. Then gently fold the whipped cream into the cheesecake filling in the step when the whipped topping is added in (Step 3 of making the Cheesecake Filling). Store leftovers in the fridge for up to 3 days. I recommend only topping the cheesecake with blueberry topping right before serving.