In a medium saucepan, combine 2 cups of blueberries, 1 cup of sugar, 1 tablespoon of lemon juice, and 1 tablespoon of cornstarch. Cook over medium heat for 5–7 minutes until thickened.
Crush 1 ½ cups of Maria cookies into fine crumbs. Combine with ½ cup of melted butter. Press into a springform pan and chill.
In a mixing bowl, beat 8 oz of softened cream cheese until smooth. Add 1 cup of sweetened condensed milk, ½ cup of sour cream, 1 teaspoon of vanilla extract, and 1 tablespoon of lemon juice. Mix until combined, then fold in 3 large eggs.
Pour the filling over the crust and bake at 325°F (163°C) for 45–55 minutes until the edges are set.
Cool the cheesecake at room temperature for 1 hour, then refrigerate for at least 4 hours before serving.
Remove from the pan, top with blueberry topping, slice, and serve.
Notes
Press the crust firmly to prevent crumbling. Chill properly for best texture. Check oven as baking time varies.