Delicious blueberry filling inside of an Incredibly flakey crust.
Cook on medium-high heat, stirring until the liquid in the bottom of the pan comes to a simmer. Reduce to medium and continue to cook, continuing to stir, until the mixture starts to thicken, about 5 minutes. Transfer the cooked berries to a bowl and let cool to room temperature.
Sugar in the crust is optional.
If using frozen bluerries, add an extra 1/2 teaspoon of cornstarch.
The original recipe is baked at 425.